Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74065c178aed4f1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 18:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 145870a9f76c427da5840af706bc5cd3 SHA-1: f1c093b24ab03a57f08d8667030b92b1156f709a SHA-256: f74065c178aed4f130ff3b5bad91d0f76ce52c3f7b65200ad5573474c316f7b6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to websites that appear to be compromised CMS uploads or are hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of multiple external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tnmetalworks.com/images/files/tagiwirenomudijexirinesex.pdf In PDF document text
    • http://tano-cable.com/d/files/wawakosene.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c749ae887---xuwis.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/bobegelubifakurevikaxofe.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/deluwubutugusebaw.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/85422932549.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mazatafufuva.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/logirufelovenatagepi.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/raxogonemupegunuver.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/pevaxulavafulusor.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kegilowajifebasudiwose.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/fugekoguponufedisur.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/minuvavoja.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/zidiradelarepebop.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/46uigd74clmmb5lakcij9u0os6/481918000.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/99552413758.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/bexavavu.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/34439061604.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///16042371317.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc041f26fa---beniwixukadozi.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/kopew.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/37809294682.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab7002475---gozinevuzevejexowotare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=inshot+app+remove+watermark+downloadPDF 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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10760 bytes
SHA-256: 841e0bd1ae0b584d33a2d30298f5ecab15de518055231b10c4526de456bc0605
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 18324 bytes
SHA-256: af811ba5cc9a7fdde63ffe31b123dc2db9ff50d6c5b83ec39dc14077da56a597