Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d2b2e65899b61d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 04:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9f9ab0e660ea78970a7ffc614b8c0d SHA-1: 4d0a1d9aa5bfb74b37b430888c916c086ff5e4fa SHA-256: 39d2b2e65899b61dd9875d029eea5301900754eded3063bcfd4e56266445669a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.cenlajobinator.com/siteuploads/editorimg/file/30896405450.pdf
    • http://autosoftware.company/autoresponders_images/files/pezelit.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed05440745c---pimatowixonuli.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d03ff9c5e47761a84cd5d0f7659a9414/napujiwizebunu.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b7870ed5---najep.pdf
    • http://rungrawin-itt.com/userfiles/files/genuxekuxipitagowe.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bbe21717---galulato.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ea3edk34d0cr025ipcdro07pbj/bamakenufu.pdf
    • http://circuitoinsulargc.com/documentos/file/besibuvaruzenixajubigu.pdf
    • http://timnhanhonline.vn/upload/files/bokawifa.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d554da45c403b0755a9594466c299196/sogamejupadodavitemuko.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/33684742188.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/67329517483.pdf
    • http://pierrevillers.fr/mairie_files/file/66438392179.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/fekosoxep.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/313gtvoqenspsdrn5e0fk42jf1/remutanomigomanimar.pdf
    • http://purofirstli.net/userfiles/file/pesaburotevukajix.pdf
    • http://artstudiodesign.it/userfiles/files/marofiwuroxuj.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/68313628251.pdf
    • https://spacio.hk/attachment/file/folipulusex.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detiwidexutelamuj.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e7b06abebce7991bacfc1c8613e7ea56/bomegibosuvinero.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef88c54e2d---saxorij.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/3775318783.pdf
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/49186014878.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=propanone+to+propan+2+ol
    • 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_off0000c946.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 16792 bytes
font_01_sfnt_off0000e158.bin
f2c6ac348307b1b379a16d0a813c6d5f56a0de98b01c93492b6f5f39e5dd1d72
pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17748 bytes
font_02_sfnt_off0001101b.bin
b7c66659e49f8a63a493a0d2e571662d27fed720fe1677b0daaa20843791fc4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 10108 bytes