Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be2ff5a3c0c000…

MALICIOUS

PDF

111.6 KB Created: 2021-06-24 19:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 143e451d38ba281f7e07fa4bc7dd2215 SHA-1: 9d81369a1dcd7323802355c70ce9a8de1f3bb9e7 SHA-256: 88be2ff5a3c0c0007af44eaba64ee0cc677c454ecf6999c0b867a4ae7dbd5ebc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The embedded document body text, though heavily obfuscated, contains references to 'yield book pdf' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. No scripts were extracted, but the extensive use of external links implies an attempt to redirect the user to a malicious site.

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://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/aaff2b1d4a64977e38b5367e22fd7bda/kebudologisalanotixel.pdf In PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/lopale.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa159d19a3f---kepedikimumemubenuvifujiv.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e495ccf88a461665033d6a5a44f2939c/suvodebebajafane.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/c01b1e31a6d5e7e0d6efd42fbdc9883a/matusexek.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cd1bbf95---luwikubufo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2d601e81---39003320866.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40fe1aafb12145af9df251e1ee5c2ca2/15476590978.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6dee70e0e---17377687891.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/8834839951.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/pexebevo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c417a10868753b7c161bbe7395fb0e4b/wixufirajujeluzuw.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd6e5e7f3---gojemeganis.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/96568779227.pdfIn PDF document text
    • http://budka39.ru/files/4016958275.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d003f496---zidaluw.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ukkap0i760rjbop5pr43f9ibs1/88004625887.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/184b51629e88437b41c3e3c427013788/43729419629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=inside+the+yield+book+pdfPDF 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://scripts.sil.org/OFLIn 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 36040 bytes
SHA-256: 542fc120864eaa041cef905d3cca4e06b36ac66fb6600c71deefe6879611d1dc
font_01_sfnt_off000163f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F6 5064 bytes
SHA-256: f985b57a59db64511bd44c6478c948df081ba7dae477a16ef5a909f7b822e9e7
font_02_sfnt_off00017535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17535 11704 bytes
SHA-256: 2bfb0a5d1777bf26294f17cc4e8f47dff603807b9c5020d5cd9ad3cb2c380745
font_03_sfnt_off00019b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7E 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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