Malicious PDF — malware analysis report

Static analysis result for SHA-256 328f8001999b019c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 07:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85f33681add81c6709e7a71f7008edfb SHA-1: 5aec4601a2767db6dad578f2ef18cc70488801cb SHA-256: 328f8001999b019cf42c0a45118254526bf3255a1d928cf6ddaedd5b90d26231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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://www.brickchamber.com/ckfinder/userfiles/files/wukaroterotitoguf.pdf In PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/pexilozunupigo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0f0cf87f2231601e96e8f7805c97eef7/mepovezefesenibokudoxewiw.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/46617528430.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/kofoxafumewoloradifaguk.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/30298388112.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/78285034823.pdfIn PDF document text
    • http://home-plast.ru/foto/files/ludokamezen.pdfIn PDF document text
    • http://anm-av.de/uploads/files/45333110593.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/fudonug.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/85727953009.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/22159621276.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/82330655366.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gomikofalafibak.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/posamasopupijilukutisux.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/nizoguvifumotixaw.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/doraxikofijifopoveb.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/a98aec5tmhsff1uo2gu1ttb9r3/28764205040.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/vizima.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3732f271053195d1d6dca1ad4f618e11/47221735617.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376fe419bd5---85076277208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=play+fortnite+on+ipadPDF 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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10436 bytes
SHA-256: 0bc7e5c1112be102a0d849afaac2261aded0a45008f3a64cd7e07e6f4aa9209c
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 17612 bytes
SHA-256: 941ef4514a2dde45f761363a5063fa879948ead66ea8f5cd4e2878baca5cf4e3