Malicious PDF — malware analysis report

Static analysis result for SHA-256 865f81a0de6f9294…

MALICIOUS

PDF

112.6 KB Created: 2021-06-14 03:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7b466ebef2d023c86905aa03f0d43446 SHA-1: 107f7e8f5ce10e6f58f9d96cb61d1ec437b15780 SHA-256: 865f81a0de6f92941bbdb25a0bb8fd2bb8ff779667792e9647e97a2c4aa68d6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=my+body+ppt PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1982a79d18---34345106311.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7pevti0ebgiumtsvc6bt0sfti0/41647309674.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/73597394041.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/23172548104.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/ketuwekijijinujaxurutagi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/adbb5ef43293dfcab1b5e4be8d956fb4/58287898405.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8823503a0f---68650739890.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zifokifepemixisigugodu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3jt49b9f93rim8cer1kvne6d40/630816278.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/efv2fi5qgh3kogb2irrsgvi0s1/2324623351.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e79df43b---46814930505.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2758234937.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a9ccbeec---87408789014.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609479041b541---xaketesejivumeson.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1a0929fd---7329300020.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/37098554885.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a65553f67---39622160472.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b53276fd2dab04c0ffff1cc9216a708/490171629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 40356 bytes
SHA-256: b1c1d5d628d6ad6e9af814a863c8285831b930aaccc49cf329640566473c780b
font_01_sfnt_off00017577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17577 4684 bytes
SHA-256: b9f1632ae6c5cd206a0cf132d262844f86b9ca24a0e400855de1193efc83ff89
font_02_sfnt_off0001857e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1857E 1588 bytes
SHA-256: 9357bfa4ef9daf3cc8d4ef4b8332fa8d813f9b8207d56eb2ac46bd1baa74b90f
font_03_sfnt_off00018d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8C 11040 bytes
SHA-256: 03b082c47352b849cf98e0bb9a7980f8abb3ba4d5614986913b26771cd156c65

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