Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c0110573f4b639…

MALICIOUS

PDF

85.1 KB Created: 2021-07-09 07:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c94f87f2bfec28b98495d910f17f1825 SHA-1: 02dea13e1b4e95b62d083843fa0d3124df784971 SHA-256: b0c0110573f4b6391587a67d0a6867f66dd0282c270fdd2550593412ec9af9c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://podushka.by/files/files/99302430167.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a69a533d---guwimulapadexif.pdf
    • https://ooo-kenk.ru/userfiles/file/jagimejozasexunedimofap.pdf
    • http://vietthanhstone.com/images/news/file/ponejama.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609452699f801---mogakatanoweretilitevam.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/025vbbitc9p4plruc8fpgp8q31/85441760382.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22e123682d---gepubilosewomopitupajip.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/03cnauq47ke5ja3ce86pu8frm6/gajubewijekeb.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1031bc6c789ee3b2b01006dc1ed5cb33/52966250744.pdf
    • http://medi-sen.com/files/files/rumedizuzafafirina.pdf
    • https://actorconseil.com/files/file/54604553068.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86e71ba4b---74172582117.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bi2marq9pag78k5hq5tm5993f2/sebamapejerosowemonugod.pdf
    • http://gyobel.itpublic/file/tefemokojumoverimufulu.pdf
    • http://fields-on-earth.com/34285112931.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1n1dru65bktv29rctkgm9ulfs7/18661127279.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/64423583573.pdf
    • http://promocode.lu/userfiles/files/tafodelikurofevizo.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7c0f31ae---moziboxubuxuzurigu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607936c4ddb08---bikideputunigererenubu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f95660b25---35451153141.pdf
    • http://originalcheck.it/public/img_admin/file///nipijawagoguzu.pdf
    • http://autodilykanka.cz/cmsimple/images/file/tizinipesigupakat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=life+history+of+archimedes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab5.bin
5977f0255c53f00d5dbd4c16a7d3a51284fa4196a6e94dd9c75a7739fe002107
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 16824 bytes
font_01_sfnt_off00011685.bin
55a0dfc504fb45aacd02eb8b56f7377f0dc1cce4091064ffb1e323603d5dbb9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 10664 bytes
font_02_sfnt_off00012f0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 16792 bytes