Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfb5e9472401b02…

MALICIOUS

PDF

64.0 KB Created: 2021-06-30 03:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c7d3679509b2d996ceace128b52c46a SHA-1: 5f70f239998c5fcfeeab94395d011885004482b5 SHA-256: abfb5e9472401b0255064b878f9870871aee4a9ec9b52481a0047d30067e0111
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed multiple heuristics indicating the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage redirection or download process. The presence of numerous distinct hosts and the use of UTM parameters in some URLs further support a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

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.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/92vf3u52bhbu1ooe6noqcenb1s/vokisuraworevalu.pdf In PDF document text
    • http://aihyang.com/userfiles/file/70038741570.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pewipolewijepefataworuna.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/mizobetu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/57663876584.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62b19c4f4---44494453413.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/31271583399.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c371c0ef173---jatozizudevimolikovitevuk.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/13127707491.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f43e9ef---zilebibigavosanevikowujon.pdfIn PDF document text
    • http://techbis.pl/files/file/pufid.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098428e09971---ralutikunufenixarovaf.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/korisigogeju.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/95399600221.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/surusilobadusikatuwef.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/67db68e68671e65d3384781c8bb38ea0/65561998514.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd85f9f1572---xepowarulitezaxasoru.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9894547a8---relijolaxerudisamifemob.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f108d282ad---53458048636.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xikijofewepipuvuxadegug.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1a6ccb7625d0353cb64e0b5be40b3f7f/ligijuxizijolexi.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/39680135134.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5764d5a7---zabituponatofana.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/zasuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+copy+book+pdf+downloadPDF link annotation

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