Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c8f3fc4055acff…

MALICIOUS

PDF

56.8 KB Created: 2021-08-16 06:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3557979fceee1a887e847c06dbde4dd3 SHA-1: 67f758e8bfe36dc2c0f69a8f60a5e10c62351c25 SHA-256: 69c8f3fc4055acff84ad476cbb0757d98a48dd38df2284359c9e3f65c7096a7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

Heuristics 5

  • 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
  • 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 https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9kd23aebue7schbooukeu5fuh2/53080202081.pdf In PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/77447758818.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/51f1980146b54d4cf9d17508a60d176a/tivejunozuto.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/44b603895d04ecf4804ee7a355c85083/sedepusosebovepugu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f53f0086d---40838294788.pdfIn PDF document text
    • http://abnicum.com/files/file/35931105797.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/55107738222.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/zasigukidex.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dff82e71b6c728125067d2e9b10c34db/67345905006.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/parusifalonemifilotavugo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/15671838434.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/29435226371.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/799d2c29f399e37870e007dd091244a7/31921156737.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/57dfe1c4cd328920063a11cad9e76a16/didazurebedinox.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a7f08afb24a8f7e30f8323acf2fbb014/muxelofaxiperilijibajo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d6ccu86s02g6fit94i7r2626e6/26319095853.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a59daa2d77f---41910211785.pdfIn PDF document text
    • https://cristalensi.com/public/File/11632773162.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/93dfdff6395c73d288181b8fcb96522f/93305951299.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d901226cb48---4407445746.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/30a0eee90ca698a137917cf9d1a755aa/lusat.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/ligogos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=formula+para+perdidas+insensibles+pediatricasPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f99b4cdacbd6b8c1dd413b0ea12e0fcb/mofazojofigas.pdfIn PDF document text

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