Malicious PDF — malware analysis report

Static analysis result for SHA-256 40751b8667e66841…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 23:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c344fb0eab563d8b0ec660b604b8a448 SHA-1: 2d831dd9d5bcfdfa46428f14fe52dfeb3b43c30c SHA-256: 40751b8667e66841122fbd7368ff7fe855c2815d0d090d4a8cac2d201088f6c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the link farm indicate a tactic to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141853f6179c---98659015159.pdf In PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/94797836916.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/xisaw.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210902053354_doojrz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca75fb002c---46076481563.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/bozunarubowobunekej.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/61672332421.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613f879e60226---dixupuzufilesobaverixi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/gitesabuvaja.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gefalijizexutevowirelavu.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/dabategelabupulifep.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sqldfnv1ja9e10rmmj4vsdrtl0/46857544590.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/12105693307.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/55759706647.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/wozepizasimiwuxad.pdfIn PDF document text
    • http://mweb.cz/images/file/57180929251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=yellow+pages+app+androidPDF 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 18056 bytes
SHA-256: 55000067e1b118ca6d82ba272812caea67894ccb87bc4c26e6c9e696388904af
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10536 bytes
SHA-256: e4add11e9baa5a1a171be44521ba2c71f4ae6ea79d07fe9e78077c8c9b8008d3
font_02_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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