Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4260f34b55a4c5…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 11:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cb3988f686c8f9f1be57cfef1cf1a251 SHA-1: fe894a5423de0401941b3e9bc2f6b371929b341b SHA-256: 2e4260f34b55a4c57f5ce7b4f6e3e9177c048efa11c03dc6752964999c3f8fe0
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the link farm structure is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08e7b3efb---56935616982.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d605e65f4---jigojumemivijanejesizorad.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dea8c06e2695c939d9593ac67fb43f3e/28869431488.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gsugapt8urs7vd3ug2hpjb5lr2/kewesivozojuworumizij.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fd7b75da---51335110838.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/np3p5c3bk7pja1ed2as6lkmoo5/74529046259.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8770eb13a---23939538233.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1d56c5d2---74787350763.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcb2bcafb---xafevidalesolosa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbd86538f---demusi.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d3151e78---femukatepodexiloxos.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/97799203127.pdfIn PDF document text
    • https://t2sc.me/userfiles/faremejekevut.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607991aa53321---20676386005.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/090d803b9b4988ba807cbbe5ca49f0a5/dotebefa.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/cinh0gpahkhcebn14vc6jp3uah/56146462940.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/71254354941.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/58420289747.pdfIn PDF document text
    • http://wajl.net/img/file/2021620132919.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff50c72fcc---34761766717.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d186cf54f---54764339556.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/17695115689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=one+hundred+sixtyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 17396 bytes
SHA-256: d4a5dcb865181905323a0cddc81859ba939131b447a48cf421393d09133395d8
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 10360 bytes
SHA-256: 247343e5d60790d0f4d2018ce980c9291eedeba071258c2f1d24519ee89c1d3f
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 3772 bytes
SHA-256: 093bd40600af12c998e5fadeddbf9e943bb6f44aac9de69a5a2b665364e45606