Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5b000a4cbdd4a6…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 01:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c651fb0452d3f2d14be9d5b6c63531b SHA-1: 695d70388fc7fc6752b817fa03a208e0b595fa73 SHA-256: bf5b000a4cbdd4a62a7bc00a21ed1dd6377c7641aaa8e134253a925513815866
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to various websites, including those on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://weorderfood.com/uploads/files/15316599458.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9ad76f026aa9b3f5e8d2a29ba1bca93d/kogatatumid.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/41131451143.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/54b07c7b28a6ac39021e3c871db55db8/37267093189.pdfIn PDF document text
    • https://medpressa.ru/files/file/neliji.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd198a7f4---43906069437.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dedc751d5f6---pijiloj.pdfIn PDF document text
    • http://cjatkinson.com/userimages/75482375515.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/92038036504.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/697ee425d5c98ea8b0a7e83657a469a6/98645322914.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/saxodeposexejojuwujisiv.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/wejanafunipe.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/78378530035.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4274f27eb6b94389c01478cecd3d4117/muvugiludiwudewonovaw.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/27123737833.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3da841cfdb55dfa53e5ec26ff99dbc97/netuzal.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49d94c67a---9015742794.pdfIn PDF document text
    • https://kede.org/userfiles/file/70504321109.pdfIn PDF document text
    • http://ombs.ru/uploads/files/48847578738.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/97384760878.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba5a5cb01---27374901026.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/kikipuxividinikexasuw.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/vusodukogurijerimimasiv.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/42237173512.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80925491433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tn+textbook+download+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://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_off0000be14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE14 10516 bytes
SHA-256: 8337177eb95fcd3e7d98e45462536dc2758d38b997c1d6b70caa2f6a1055d8ab
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 18548 bytes
SHA-256: 8fd22720ea9e546c017b9591d1ab4e56aa6573ba605f2c56789d09d25c1f032e
font_02_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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