Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0179d1d9a6e806b…

MALICIOUS

PDF

90.5 KB Created: 2021-08-19 19:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 13bb212b5b235226d52b2faa8fc3b3b3 SHA-1: bd5e005aa18d5ae4f2b32b391c24b0bf70343373 SHA-256: d0179d1d9a6e806b3a61bc1c41a5a426676106076c135712a01fa1776076e85b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links pointing to potentially compromised websites and disposable hosting. The heuristic firings indicate a link farm designed to direct users to malicious content, likely a phishing lure or malware download. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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 http://cuspsurgeons.com/userfiles/file/94541599655.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090de963153d---jelefuze.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zonovedowalekitezivoso.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/guputakosixojivawukejil.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a1e7bc1b---zoketujevibites.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f42cef52---buwevilepeneduwe.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4989ccfb3a2342d79fbf66f8f715244c/zopetogajakobofivasobufo.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/39390589886.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087467126349---27968817225.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/10671938102.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/mamewawumuwoxe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d57df028b---netixoti.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171e7013d4---93578908810.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/19023278927.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/40235588874.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/22733270015.pdfIn PDF document text
    • http://mextro.de/upload/files/6274516196.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fuzejawigilisawebanewituv.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/85290794005.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3f7n868mnlq4e5ahcfn7rjq0e3/21519217875.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1975cc42262025f4fcc74eda1d19a336/32598494977.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/pelilexixut.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/91517047890.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df28ffc5109---7764452815.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/rawowufufarovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dna+structure+and+replication+crash+course+biology+%2310+worksheet+answer+keyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 17468 bytes
SHA-256: 1a35233aa168cc9f9e69cb0d1722682a8c2bcd3ca63be0bc88ecf9bb9ac229fe
font_01_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F91 11148 bytes
SHA-256: e072e6bfe3c6ed9a185145724e75bf6d185ad51bdf7afd1cf812fe757db82bb1

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