Malicious PDF — malware analysis report

Static analysis result for SHA-256 93565dd9c9acca9a…

MALICIOUS

PDF

102.9 KB Created: 2021-09-05 08:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc509ec8f25d9a8f08ff591304dca9cb SHA-1: f3ddd953a9f9b98dbc5feee3a3cab57eba111122 SHA-256: 93565dd9c9acca9ab985fdb081779795df48f962d3df8fcdbaabf366bc97cb2c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://uppersanduskyrotary.com/cms/files/File/44177141076.pdf In PDF document text
    • http://shriadinathbank.com/uploads/87201940661.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/bodadalibofagina.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/sufov.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/60292535376.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gbu5p4ut66s6boksr574vg4266/mawumate.pdfIn PDF document text
    • http://rnralpha.cz/res/file/21880730212.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/ruxosowufuguwifeba.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/67017684711.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/4902158378.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06117013fa---87772338381.pdfIn PDF document text
    • https://lesura.net/userfiles/file/70474579485.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/lamekisagekesetasodanifir.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6ae60c6e7ef5579a2367fce6556334ae/41150805510.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e853eb7ab63---35101812279.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/44520798612.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/34369538646.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/nemuvadowekowufarasebetav.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100295dd9e40---3023683148.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/rurebepelela.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/14243697888.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/k7f23eevi8n19khbmgcaf1ttqg/manikuvojepemot.pdfIn PDF document text
    • http://acelybio.com/upload/files/jajutunovake.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41c52de8c---lelixavefog.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wamifimoziga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=physical+fitness+pdf+downloadPDF 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_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 10820 bytes
SHA-256: 8e6f1d8e65bdb0fc5a9e3dce127c4db1c56ebadd75f84bcb9bc5fea4b69aa8b5
font_02_sfnt_off00015ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA0 18060 bytes
SHA-256: 36c547bdd7021385b0def8cfebebb44d2bfaff444844ff6de6260f210ad25aa5

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