Malicious PDF — malware analysis report

Static analysis result for SHA-256 70abf444d9d863ca…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 04:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 477a56c97b6643dc00ce0838b21ad1d6 SHA-1: 076f16c5bad106d10a75a4eda8b5bffc0ce79b7e SHA-256: 70abf444d9d863ca3515faa4860256d30443c84f8812dc454c323a4dfd774475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b788993c---43825518157.pdf In PDF document text
    • https://cabsfromheathrow.com/userfiles/file/86193215387.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e0ae21c1---zukakoliduxik.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160860ee6265d0---1413685606.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0a7771e95395403bd0ac3b7086f7f20d/99940516848.pdfIn PDF document text
    • http://citra.cl/userfiles/file/84479197889.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f07080152---28844733443.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/zumuxakes.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7adc142a2352a5523be8ad543f165dfa/xagenojewaz.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/12334183942.pdfIn PDF document text
    • http://rsst77.ru/upload/files/gitogawe.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/da4149fdcdd931bcf3f2be830c3bb9c2/kijaxigepajelumitozobox.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160957085c4dbd---revoxogetowarafez.pdfIn PDF document text
    • https://starbox.fr/img/files/xejuruvuvideviwujokoparok.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/rulitapurugevanidenuj.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/gawudugilizowurimoteja.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2c516ca6---muxudo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294be2c614---xukunavezagixabom.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/39547106555.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/00abf8105639efa742a174d3aa88289f/pesofipuwelekuser.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/remizimadukovuvofagufoj.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f82f209f97---43040713157.pdfIn PDF document text
    • http://ezibra.pl/upload//file/98531859423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=a+little+life+book+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/1700559129.pdfIn PDF document text
    • 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_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16940 bytes
SHA-256: 31ee7e79f94c8599dacf146b428a6c6e30874221fdf6f4c68c6d95e2b31ac948
font_01_sfnt_off00013053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001486a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486A 10376 bytes
SHA-256: 6213a9d085ecdde5216aa049074dea7e2725df1a3549378d7205852e806ed68d

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