Malicious PDF — malware analysis report

Static analysis result for SHA-256 291a267207c85934…

MALICIOUS

PDF

88.6 KB Created: 2021-07-13 01:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8989c84fac1a98561c869f87f09d4896 SHA-1: 915e6bba55cc30c1af0c4c19ca1e6850bde4caf7 SHA-256: 291a267207c859346c5db810a443c21f8d20d2e0ecda01c54be93f2c3f464489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm heuristics suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://ketchas.ru/uplcv?utm_term=driving+range+meaning PDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d24a971cff314bbeedc272dfc7a59ecf/surudosiwekusumexedini.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0olos398s5iaq2q43rkojmvr4q/defopuzapageribu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ea0940687cb2d3897347b43f4d3fb0f6/32631304490.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/32286733583.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfcb8e99a---39806509682.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc3e1f269c---90936734397.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/261210244126.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ddf212bc---fazalutemovali.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/89811114028.pdfIn PDF document text
    • http://morabia.fi/images/file/73586646396.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/mosudizaj.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d810b0d5ea3163dcd067d6eacb3473c4/fifobano.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeee79e7e6---60813062639.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867fe5e390---bifidazusaremijesik.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ce8ca67f1378bc3852752e784bb9d23/zepodukowax.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a24105dce01---93118439802.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/70842125148.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9eaec8eb3---fapuse.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1d14a0e6500c96f389d4d8d06b084620/tasebo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4fff54a3372860f7f4331fedd94f1498/wepewidakoxogewawin.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/94296418033.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/27948203220.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/dokanilowup.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_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 16824 bytes
SHA-256: 50940e81ed5e45e645391e2f35afa72de8697b12a52f90e1e893f28ef401651c
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 10084 bytes
SHA-256: 54e1ef7da6e1558e161e20cd3eba206222f22a5d350f881fafb9dbd19bfccb9b

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