Malicious PDF — malware analysis report

Static analysis result for SHA-256 8895ba2f5095c21a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 06:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff7a5b64c132bc5b76f3df2864d1183b SHA-1: 4daaaaddf32bcf6b592a5d0101679c2a42b58ca3 SHA-256: 8895ba2f5095c21a64783b49a4f80a1a9be7d147ad86cc69cf2e19fedda9ce43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly indicate a malicious intent to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harasim.cz/uploaded/files/sisedadovuvupubunemijigur.pdf In PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/jinorazuwofosegetakexi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/figekidexizigaxitabuma.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a719f932de---5599456122.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/dh4v6ndsavb4ejeputadb2riu0/fuzijexude.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/686c8b97dcb79df6f5d413da09b831e6/93744952368.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/33191211143.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/girsqeni28of503i6nsf1i7tp1/danizizu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xivigiwimupenipajix.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/nujununufuwajarupimuxumo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d40e2313---lesurixora.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h2dqmb0c716jldm9dpnvgrimsq/xikamisivul.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vsftqrsrn66t1tv3bnkj8pd1v4/wesuzulosegeravugowagaxe.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/89acc32ede4c047629a9e435a02b2c5a/gebarerumegafebakex.pdfIn PDF document text
    • https://parfumzone.ro/files/file/zakoxato.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ebda4ec87e4c2ee9d9db42f7465d6a04/kemuzabe.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/17990619794.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f24ab1d9e---puwapadalavone.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607301d0d2536---nagimororejebuxexi.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/64266559833.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/74711847459.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xumudewanaz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c6a94e0d---42393420873.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076253d0223b---dovamesososim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=connectives+worksheet+grade+6PDF 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_off0000c033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC033 11044 bytes
SHA-256: 0b3e216df33be186eef079743a950b8aa0dd430584ad261d93b528658f9b8461
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 17456 bytes
SHA-256: ef0760be44da7ed412805c615ae9c10d5185bec477a20520a9d6bcca7caf912c

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