Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acb7e5c6227990f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 08:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f2b68c05d27dadb755c2ca278f53450 SHA-1: 835c9ffa5af287c3df248022043579759f202f47 SHA-256: 0acb7e5c6227990f1bdc255baf023b8c275d8df481db17074ae3b1c49a9b876c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The primary purpose appears to be redirecting users through a series of links, potentially to a phishing or malware distribution site, under the guise of a PDF conversion tool. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

Heuristics 5

  • 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
  • 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090458e2acb9---ganewikotug.pdf In PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/zowatugofisotebapefig.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vototetigowijesaz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i48c6j16gr8hor1aentb389hah/gesezafojup.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/edeee657bbb696f73d03ed90fb4202c1/28497776418.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/jusawevanubopuziwojuna.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/240e0ce440820c37935d33eca741e3dc/96348885047.pdfIn PDF document text
    • http://landia-print.com/pdir/file/xatozituzijisemewevit.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e12c2ff6---mogigopetakij.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/30419938811.pdfIn PDF document text
    • http://c-amc.com/upload/files/kubuwoxamezusi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/jajizokuzovu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1453537cbb---lavokadeg.pdfIn PDF document text
    • https://miet.hu/kepek/febujofarowagagakaxu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160730fec89a51---noviwufanobobububoxoni.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/levonelediv.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/41520341685.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2oreu3bua9afu98n9dnlnuk9pi/bukuvutusisikuxera.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8f4b3bbf01ab16c9f89f7f5c2db2021/67803760264.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/43296946109.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d685cb7db7---zarivolufopizekuzelifu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d89e52849115a9dd88eac8c0803141c5/wurej.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1hpkpa5c55e3frrt8v3rlh1j9q/81352467147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+to+pdf+for+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10120 bytes
SHA-256: b6265e78823f6be7cd503f651a52f768c2432b373322e7a57e6574b4ed172f3f