Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34372c551e0632f…

MALICIOUS

PDF

82.9 KB Created: 2021-08-16 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2041f820b474373759ed0c2fabfa42e2 SHA-1: d7526cf3eaab94de440936673e229b1afa41c30b SHA-256: a34372c551e0632f2c08c0b8f946b51fb43ad2dccf1a874a277e0af775f2d90f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and attempts to trick the user with a password-protected archive lure. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS uploads and disposable hosting suggests a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oreade-breche.fr/userfiles/file/ritoxogiwebujodo.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/32cvrndrq3i1tt58uk2a5lg2b6/28093705170.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/zewojanejowevunejomorofe.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/96087493277.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8d80e203b---37593167658.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4q65l513ka6b2cbagpq9tt58a5/60658224876.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e33b66e301a6b3203567cc3ce06ca3e7/pusiwizaxepap.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/wuroloxuno.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/16132779451.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/luleraranejafa.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7f8992d4de9682f9a42b795dba031217/1481383657.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/tutatipif.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/ik0a3sp8bmg0mq78i0adtftceg/woxez.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087daa746492---61429813921.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e7e263b3---93087652551.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bha58o2qs22nm0qqgj88vbaqrp/xorira.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ed263249---14551271267.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f21dd1cc5---zuvogibimo.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tepenokorinitoludikesi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3ae82e75---mozoganumipijajeweken.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kvu6gqlaj45568ktr8vrqphd65/53709293526.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/26044012677.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd44680b82---fizeragef.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/31556631362.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c987438e376---natet.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/62412176625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=biology+11+immune+system+and+disease+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 15872 bytes
SHA-256: 3ee1a33d2953cc0a79bde61b7d3344c9aa06714f9b3aa5f9207b12b41ebd9db0
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 11192 bytes
SHA-256: 213c2de8f0f7416cea81bb161209b7004a024f2b639939f1e5b762e01fe1449e

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