Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced9402471e45739…

MALICIOUS

PDF

96.8 KB Created: 2021-06-30 23:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40b1fd820999251032bccc189086eb59 SHA-1: b0b2034c1dfa1ef67150491310b9a7d8bca525d5 SHA-256: ced9402471e45739375e310d9bb9fcc75c86fcf667a350828de952f1c1f07b20
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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
  • 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://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peridekipivagak.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/zisuvez.pdfIn PDF document text
    • http://halaljones.com/uploads/files/9232363481.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0f11570d0626c2e0091e867771abe961/52791839433.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jarawuperetipi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d751d9f90324ea432ab6533a222f7e76/gazasasisisedukokop.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/1vd4ntdd4ovek616rj8bqf2nuh/28720408529.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/66567536197.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96c3bc503---xamoseju.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c06929916---rotoxojituge.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/717j6fp1voqi6hj55r6jgfe0e3/11671133302.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a37aa0cefef---73638330303.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762a94917c2---98219167572.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/53398589835.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/tuxaru.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c0b62891---27787495445.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/mibawolano.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/xudefudixufaxa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/63618316461.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ecea05ef---19352230525.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/40937598848.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fea6127bb70aee1a35259f046a6f968e/vosagodasagutojaworufa.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/9124415896.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079011b07027---nutilija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=composite+functions+examples+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off00012b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 18092 bytes
SHA-256: 748229bcee5ccbd4b5d45594df12f7406b8b4dee12ae25b323aa88fdc06a8a74
font_03_sfnt_off00015aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEF 11156 bytes
SHA-256: 015a31f2d754f5868708e23841dbba19ddc7a9775ef012630bc3df0a428f8548

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