Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc69a70edad9d96…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 05:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 822581468b9175e37f26aed145938757 SHA-1: 85dbc770440ea1c7e5d6a464c10123d67875e842 SHA-256: bbc69a70edad9d9602c2c7613e6bcab6e9355a8e504e3f826577de3d6077637e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple external URLs are present, many pointing to PDFs hosted on disposable or potentially compromised domains, suggesting a phishing or malware distribution scheme. The document's structure and numerous external links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fields-on-earth.com/images/blog/file/kovufuzedutuzeg.pdf
    • http://abwbaltimore.com/uploads/files/gepegigejukululokijivixid.pdf
    • http://linza-market.ru/upload/files/80354346562.pdf
    • https://talenthunt.biz/userfiles/file/didanox.pdf
    • http://mariondhuique-mayer.com/data/file/93199680674.pdf
    • http://divapharma.com/uploaded/file/74452429612.pdf
    • http://xn--z92bzy85x.com/userData/board/file/dedomiweganokadalusu.pdf
    • http://rigassprotes.lv/uploadz/file/kuzisutinijilugukasu.pdf
    • http://luberoff.com/userfiles/file/25188493627.pdf
    • https://twr1115.net/files/fckeditor/file/8160919160.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/69661850508.pdf
    • http://apsara.ru/userfiles/file/voxod.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/82346038583.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/joxevixitilafawufug.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9a365d6772d3a9faa143e99a4735e50d/73580147642.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/df38ffe3ba1197763b6cca7efef69a46/6487748386.pdf
    • http://redactron.com/userfiles/file/39883215213.pdf
    • https://goodline.by/userfiles/file/99000782484.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/84c46287611347054fd0825bd130c384/80935241794.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/voligebogalixuferef.pdf
    • http://legalinet.eu/userfiles/files/86109681471.pdf
    • http://ytbozhuo.com/upload/file/061530568371.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=link+to+apk+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56c.bin
093c26389ffbad11a5dee9cde52b8e16dd94372cc972e565af4185995831f17f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 18160 bytes
font_01_sfnt_off0001054f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 16792 bytes
font_02_sfnt_off00011d66.bin
317a25259f0d7cde4155d9556f4a35c3cdb08000975aa8c68641f03737d8984a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 10268 bytes