Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e88f0a8b57e573b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 10:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5458578c38b80ddd6f75e8be266148c SHA-1: 3c8e77f0dd936c5f54f2b2bcbbc52f3260a2effa SHA-256: 3e88f0a8b57e573b58baa45256279ba88c0d3492950314f09d8026cb0ce5e66b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://thetsaban3watnuea.com/UserFiles/file/lalorigigebejakobapi.pdf
    • http://nguyenthaotech.com/upload/files/37526165432.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2k7u05qu7sd0tg4q2vkp7h3ul6/mevazasoti.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/68708128932.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/607b06ac99366c98d39b2542ad110a03/segixa.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c97441e78332d7b8669a0b4044f5a8f/tajedibelumurelom.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5793fab---25862957807.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fca69008c---10262869142.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/294bd75c441e92ee502f32c134d6e64b/17333903422.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/80f69b09b840d6ba65417175a268e651/gididuzinet.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/092b775310ffe4422f1718a4252a9471/fonaronivodidanetora.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/da0d0ea9b0ea55635451e1474645f348/37264881184.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/npllta3k5bfrg1vm8o6fscr95k/bupomatebidagev.pdf
    • http://technoculture.cz/admin/upload/file/sukaxegowatozaserafusi.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161240a16aa768---93259908534.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/87f21e1ffa49251a9053e307d5502a14/23133063135.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3600c0c90---figotopudetisogor.pdf
    • http://chupanhnoithat.vn/upload/files/wokugifupowodufupumukisi.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/52099686787.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dogesegalaxupavev.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nofal.pdf
    • https://fizjolech.pl/userfiles/file/lukali.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081071fcdefe---jobuxibajewosoxegevap.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071de597869e---62891309864.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609002e5f0576---53910427192.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079366dd7716---44251587353.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/wupadewanarurivuraja.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a382dbfeca76ad3409e6698ab59a69db/ginujulizojus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hummingbird+facts+worksheet
    • 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_off0000c7f6.bin
8cd494ad26f68515654ea7dcdab0d9d08916faec6eca271c92b860c5a7571ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 16880 bytes
font_01_sfnt_off0000f39c.bin
dcda002ab9ff54a2b0d953cf91b7d1a6af802f1ae272c4f9c54c3cd858a64bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 11284 bytes
font_02_sfnt_off00010dc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.