Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c5e8b575732317…

MALICIOUS

PDF

215.5 KB Created: 2021-06-29 10:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00b667b59b01f2e3e89c9eee6d9057fb SHA-1: 3673231719cb9861c91d749231e0bbbe494713d8 SHA-256: c1c5e8b5757323174f48cb43d6f4c0c59003db35e294c409a7fd4821e4f4b216
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic and multiple links to compromised websites hosting PDF files. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings further support its malicious nature. The document likely aims to trick users into downloading further malicious content, potentially leading to credential theft or malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7dc37ee1afe99c86f540e267868f4f42/nofafovowitev.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b8a4aab8---didivajetewe.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tedepuzogok.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/38807444155.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/penepagijefabube.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4246d1e81---kotogiwenem.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fcuuj152kclm310j9scr5bd7p8/tekuligap.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mcf1klmljtjb79q2c0rn9nkc57/vavugoniwoni.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62b32fce8---nivuxezuvize.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/26412053494.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3eaec1d43503ab74b175b0b61203c4e3/38748930701.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/pusim.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5ni6hsaskafsmbeffrlggaa8g/55958437377.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ffc62267f1a46ddb201e570b9a0cd139/tusav.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/febupakafarapimemavib.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099286a1ae72---vovarukolodudumowisuko.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8e23de9a7504875838d1ea0f27e45035/10054163727.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098b871819e3---peroximaja.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8afm4o43febpak8se4dna6lrc4/jufapo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cb1e5b3d---60455922883.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ar9dpr8i1dvhcov1lk6n6ilrc5/94176744080.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5265437dc42e1e1f9e89d73fe3c4bbff/70373240809.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa3599c14---88736366929.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c5374c17f3184816da5f4bd9c0485954/36372110417.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/dutofugomajudekuxulola.pdfIn PDF document text
    • https://dm288.rs/slicice/file/74168034822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=naked+and+afraid+nudityPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00030567.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30567 17544 bytes
SHA-256: 5d2f2ba19a3c03768c56ada37c1d6cd28a3be85395b536a37ce100e18d0c3c18
font_00_sfnt_off0002d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D06D 21488 bytes
SHA-256: fade65310884485baa81d89fd4a40c26e2f965175cc957989e9b492278ddc991
font_02_sfnt_off0003204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3204D 10296 bytes
SHA-256: 6ff0675c2c0b37e974c1ff574308c4bad9e5bf659f8bc028640677ebe815fdb2
font_03_sfnt_off0003379d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3379D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1