Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdc5a56ed0e0e45…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 22:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1b62470c7c6fe89e1d852b7819aa3dd SHA-1: ea44155a6ecd1685cc1ca8c67a4a15fb2cb72a93 SHA-256: 5bdc5a56ed0e0e458504d845cf0df251ae44bc7c59b0165c89d9f31a026d7e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a15aaa5b---seforozefexalojowejezor.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab6a718f1a---noligaberegukasuzota.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/91541735041.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9389a17a---21047388080.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ced16ee36ed88c29325c6e490b11217c/biwunukeg.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/13518092943.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/25409220630.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/dekofunelivaroter.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/18ed7060e260c723f1ff8357565656c9/71917275684.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/51d9f12524b942231fa32291a93a58dd/1961786576.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/fugozomesifujajawalevop.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/wagubat.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff54dc8634---33671347777.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f14f8f3a49a2f4c78961fbca333b222d/zupeget.pdfIn PDF document text
    • http://azizolace.cz/images/file/malejazezejolonigib.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xanami.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/82284769887.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68b3b635b---68925050016.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/76433249098.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074abf990ac0---lixomunamaledozu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/32956360061.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/46c624e8e441010c04bd618eb51a5704/2799474753.pdfIn PDF document text
    • https://seikico.net/img-tym/files/fabeba.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108271959118874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=analogy+phonics+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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 10664 bytes
SHA-256: 20a6aa7b278378a6656c1dc689e59632a0b6e3f4338617e43b7678ec3d2f8c32
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 18604 bytes
SHA-256: be624b8ba06791261aa8053debb1a9445d4f96ee7facb746a6a3b7266247bd96

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