Malicious PDF — malware analysis report

Static analysis result for SHA-256 d634621be6ab4208…

MALICIOUS

PDF

76.2 KB Created: 2021-07-30 12:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1dfd0e0748abbae1b62af6e7cbcc44e3 SHA-1: 31e2cdd2f6bd99a0d00e928be6b5ab8acfa5e5e0 SHA-256: d634621be6ab4208cc9cd4b9eb235747f1f5e1196212871ea6f385dab5cdf582
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common malicious document distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=adding+and+subtracting+positive+and+negative+numbers+kuta PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/njn3u1ng48bthppsk702d9kai6/97941678935.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/l8ketpf7f21c3r9ev5tc81aode/xorerogexamelotudadokef.pdfIn PDF document text
    • http://rentaruedas.com/files/others/vozizo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2675hqufpm5rr1hlcfp0p26bm6/61296221867.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/72204bae18434f9c5cf228e77480fa42/gozam.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ab883649---48330798094.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/473c05622e3f303683ee19a6cb402f60/fupegajakutifosizapebo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0203e2c755673287d45be20175806790/98820139185.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21270409265.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45b5a518b---jifarorisagevagimipisogux.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/tigadig.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/bojiretimorogumaxusuxukex.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lsvkg75ql7cv4uumfu2gref285/valisukose.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/zutafojesuvijok.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xipirekawolotidezololil.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e4339ac457a---10817318419.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/81482912405.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771925da7fc---67376111604.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/da80b0de681d423cbd4b70c7da360141/26768797164.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65261e5e2---jipijeluju.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fbfcf964f4beb7e6f02fbd5e1c25f30d/63804455808.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/23930607451.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/20355339073.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/5120244120.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b156b5cc2da---nufavutibip.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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 15164 bytes
SHA-256: c0d09a14319d24ef341f2b6d212e7a739febeb178c8e415c88674dd5b2c56e62
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11192 bytes
SHA-256: 6d3d0678e51f6d4a9d7ae8c5fbd76c28d6b14ddf351ae5539a611e28935c1e96

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