Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbb1d05716b0ea7…

MALICIOUS

PDF

90.8 KB Created: 2021-07-28 07:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6b57ced43812e7a144a55fe489f8ef8 SHA-1: f71c22503accfed52b76026fa976eaf6b41a49a8 SHA-256: edbb1d05716b0ea7185fde873448540f45551623bda1e61f2affb155f4a8ba30
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick the user into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure suggest a phishing or social engineering attack, likely leading to a second-stage payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/183gntmepo35s4sho6vhe3euhc/42100126962.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea041a7f1c---busufiv.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/88896514852.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9257109067.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d8f255127eb8bec49de2ae1ed6ea1011/42903036669.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///favefemowirosopikufexutu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c475757cb2---5796458224.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7iqo81ebbrdd91e73pfcv3t3vk/93184840635.pdfIn PDF document text
    • https://hoalavender.net/upload/files/tovezikevenafimabama.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/6838471414.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o6fqg2a7emad3ibcfo0gfp0rpi/1040341449.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/jixovibewesalinugewunaku.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fa492af3---kanidexidezuzepamumi.pdfIn PDF document text
    • http://topstec.com/d/files/53399698801.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lawalekutusijuru.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kv84g9cvgvvf5c3i03f1qielc5/82061403196.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/8660332968.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-16/20210716082501992896.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/17771571810.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/57ggblvf928c63lcql084fb434/matoxirobo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/515622816eaadf83bf5513934feed343/96166447493.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/fidaworibolimevofanujoza.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zozemituzedidu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i0a2qjnfl544saf60qg390dmt3/zevonufusutokunesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=arya+mp3+songs+free+download+320kbps+zip+filePDF 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_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 17064 bytes
SHA-256: 1975a03b4179496ef5b0fabc0ace7290350ae105323b67e08781551a367b6ff0
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 11632 bytes
SHA-256: 7ad902380816a05521faceae509699187dd76abb5fd65cf554a8ae6f860db396