Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bb0f5d0c4e75a4…

MALICIOUS

PDF

88.1 KB Created: 2021-08-02 21:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 860927900aeb1c1e76a039f019e04ec3 SHA-1: 870d456a269274aa1ab4bec79dbaaa626b4f39a1 SHA-256: b1bb0f5d0c4e75a43dd753e5ff6dcbe9934b5938b370ae6490f0257e9f105f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The heuristics suggest the document is a link farm on disposable hosting, with some links pointing to compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=what+is+a+comparative+adverb+example PDF link annotation
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/64438541273.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/nimapumejivamu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8atgh81ugri624fihnom5ppja1/17810423549.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/rururajalupilezexuzor.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/nudajizuzifuniwapexaxet.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6037ce1c94877a1a2cc2e4ffb2611698/16264447775.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/paduvebofabubofajuped.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/26209695842.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2ff29360---16725050072.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0t9dfd4ra333gj223n7qugof8r/zavozug.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/fipinatisimez.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6607fcc428---17997549682.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/vapesademesejuwoji.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/39173674604.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8d63c4013f5750bb51df684796d9f0f9/31086393563.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/81083057413.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/p7tu4d61unan6pi7nunq3qqte6/47008559010.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c5f99a6bf2e5ae872d6f562cc312c643/tigibetopode.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tadogerawezuvom.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/781cb0f8f87995e1d4c9ce197b9cdecb/59073668189.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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10976 bytes
SHA-256: abe0ef7f79ab17b14f1d23d76ca4959dce64562a7a0fd11bbd28ea31a634ea2d
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 16952 bytes
SHA-256: da536af8d4347f006b003423f32d0f3b529b9050c23ca64405e951becf312ffb
font_02_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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