Malicious PDF — malware analysis report

Static analysis result for SHA-256 485952f576023eba…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 18:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa44448ae6b5a48638ae4ef209bfe087 SHA-1: 3bd95ae873ed418d8eb05fe8d3becb95be09d00f SHA-256: 485952f576023eba59f5207b5d6fbfaa072713e5477a0e9efeb5c155bb7ff19e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lex-ter.ru/admin/ckfinder/userfiles/files/93025501164.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99811b019c---fovolufaxubevu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb262f218---vagujiwevurofewa.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/dewikatulowagewejulo.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/wugevagebunudawado.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec524dbe38---3962513587.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7uesh7okmqtqoe1i2o8gbvl672/63572150770.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/mutodekoseto.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jajozanifuferabutame.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0079980be886df1a62dbab868d31614a/65151602726.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/62667270780.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100a09427aca---73367930484.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bdf3r8at1rbh8ngr94h6sbmhrf/kagarokikenokizenerabo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6910e6bf77---7495257546.pdfIn PDF document text
    • https://begili.com/uploads/image/files/fobaniboxiromevipidukej.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/judokidafekunaleraberuvi.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/jabidudebiruwi.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jokozudiwifi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e982772532d---7240302043.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/tezunotovojeloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2018+volvo+xc60+owners+manual+canadaPDF 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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 17324 bytes
SHA-256: 97a493ace556ca675d2890a691de0207408afd0415fcd808090907150778fc01
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 11268 bytes
SHA-256: e54a02395e032ef8e76e1ab468a8993e1d756a70b6e3d97d703d1ceb28c5cd96

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