Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d44a9fa382ca487…

MALICIOUS

PDF

84.6 KB Created: 2021-08-12 13:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2016220f99f7d67dc650d8a190a2081c SHA-1: 26e71385a03f2c7287f1f4798d86110363d112cc SHA-256: 3d44a9fa382ca4872086cfae7400991e62c39b6f31058be02a0d4178cb61edd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://dycmc.com/DATA/upload/files/202106230252464863.pdf In PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/9191784529.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/21489118642.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/26472434566.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/85994083028.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f031e0ba7a1d01c0ace86769d32a92b8/82853784608.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/59845093828.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161147cf20757d---69139220287.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/90643866029.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/4072009975.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/87076103046.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/gukafixemex.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5d9bedc5b---36014260381.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/42479012029.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/66501243175.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608536d2d32ba---17612523019.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/448226ba0c4872afef9788ad2386972f/jowixipodunaxuva.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/835942a1c738ae5919b0f2a64c202186/48442091605.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/ravuvenid.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/npv91lmupjm8615gqmrbf4o6o8/50379585500.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/76932218348.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a502f59728a---fuwikezipafanumar.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/42104715419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=meme+music+on+piano+sheet+makerPDF 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 17284 bytes
SHA-256: 029ed9891374f8e07e06082d187ab7f9459e8be33b084479232f254edfe8c33f
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 10776 bytes
SHA-256: 7689dea4e9792802483a0eb4506021254507911c6e3c640528350bc815ed2bc2
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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