Malicious PDF — malware analysis report

Static analysis result for SHA-256 0644dab1288ee952…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 01:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddcfd808f71be5751f7316b5b9519ea1 SHA-1: 59aa11ea2e941ece3319f1093a0fa739bced0c3f SHA-256: 0644dab1288ee952591b314bb2b0af2743ae0c1cb85576991247c46833b93f7b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=prevalencia+de+diabetes+gestacional+en+mexico+pdf PDF link annotation
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4uv1qan1gchhuv5jkm708neobg/93380612361.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a370034e2---38395820291.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/28775401764.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zajatudewapu.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/19590812053.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/rubebefovidavaromabuzaguv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tctms1e7opmtkvta8b3ph8enn4/63320381298.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2e1vq31dhn1s7g19gtol1st2gs/dozemurikofetubujifetim.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cc2258b5866d47377661adf7d4e6bc26/29824519395.pdfIn PDF document text
    • https://csn-alliance.com/data/files/ganutakenazosopidunir.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210624_61373CEFF02FBDF1.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160718c7b047be---96892213707.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/45b15006cc0dda53d2ecae56bc8d1160/90371731232.pdfIn PDF document text
    • http://getdol.com/page_data/file/15936209758.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210718_AED66FD6FECA3177.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/128648330.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/63483483890.pdfIn PDF document text
    • http://wsm.hk/images/files/73547223648.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88eb86fc8---39109884017.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25979680c---99837110439.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/jewekekurunesemavitopufom.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/86577754560aaf8371c874.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a62a33dd---fozepafazofikepa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd143f2437d---gibesexapide.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 20780 bytes
SHA-256: f38a30c7f912291e75fa3d2841a0d393fed46530d4124cb744b5c27c14bf099f
font_01_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 11272 bytes
SHA-256: 1b8768eda9e3d03ccdb1593a245e5da13ecaf489023054c7b43e43533aea2571

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