Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a9e4522e03316…

MALICIOUS

PDF

93.1 KB Created: 2021-09-15 20:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1c473eab56dd80071c2cee933d5891c SHA-1: 422df85ac97f2f788225bf90cefaa66c1fbbcbd7 SHA-256: e54a9e4522e03316e9c2c4db10257e828a39b90777bb101fb7f031973997e6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://danchrisjewelry.com/userfiles/file/guxojutonogata.pdf In PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/kugezajurovawalizosidet.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a21949f8---41763482875.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/66982471513.pdfIn PDF document text
    • https://orangerun.re/photo/files/jujot.pdfIn PDF document text
    • http://saaretravel.ee/images/file/18032569427.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kijaxo.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/86054349953.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/nogutizuviravewasorenefi.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/23238367797.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dad44ac0489574653b3c27e7d9bb3fd4/piwuluwogedolusexonom.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/60197323584.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210901_132237.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2e1c4164---44249581986.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/liresutagaresojok.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e02d91e3---mixadaro.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/98830631597.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135ebd55c5eb---menexujenobu.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/fawege.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/34730663412.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/babanupitiguzomu.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zawuvobujoguj.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zezam.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/86610017479.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84022239340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=justin+bieber+ft+daniel+caesar+lyricsPDF 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_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10692 bytes
SHA-256: 781f4e7b150af49d3ccc7cdff6cfb74a7719b50562f80f8a8970f03ffa0feaf8
font_01_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 19328 bytes
SHA-256: 333a8fc1e8050e3128080f5b4144110f11854fde915779c7178f36d636f1349c
font_02_sfnt_off00014e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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