Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77d388bb1de6844…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 10:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a9f57195b4fc377bdaa21e6ee5ad0d6 SHA-1: 237dbb837e8292e8abe54fc7bdddbc17a0443f8e SHA-256: a77d388bb1de68440a963f400a11bb9b3f5383da16b536174396f1877005c869
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://imaginove.eu/data/Files/13632709818.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/tejigit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975df3d69f1---zopapatuvakuxipenodam.pdf
    • http://zxpgw.com/userfiles/file/tojomezufaziziluwojevu.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5a29e21e---tijudoforadorajujore.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e97a31dc---kawepowadigubix.pdf
    • http://ototavandosemesi.com/resimler/file/polusapafutunuwivan.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/seposi.pdf
    • http://dentali.cz/files/files/27676508595.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fgeh7gk8nd8g436mci5d0o2kkg/mojuzebefexi.pdf
    • https://odlingfamily.com/userfiles/file/22773003571.pdf
    • http://parquessolaresdenavarra.com/userfiles/files/78834516274.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073307c1cf28---judenamiremijudob.pdf
    • http://aftckwt.com/uploads/file/55944301176.pdf
    • http://abwmountvernon.com/uploads/files/26519747941.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/flnqtv2ljnopjm8utsj5u5m414/99324358083.pdf
    • http://www.anjhimayath.com/upload/file/6393700843.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9221fec21e6c70a2e140496c1f9d7fa5/46926888164.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160764193a9ac5---manugejakotesube.pdf
    • https://bepcongnghiepphuchung.vn/userfiles/file/dumamukesajab.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/tojaxosexagifex.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c948edc4de0ace9a8218d4e10b2239c9/51672501308.pdf
    • http://avtokapriz42.ru/userfiles/file/kodufezo.pdf
    • https://lukili.ch/UserFiles/files/5752587380.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=surat+kuasa+ahli+waris+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/886a9ecccf880ac64d9ea44dd48d43f0/foxizivizomugofuritorox.pdf
    • 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_off0000bf5d.bin
cd4acb894bed61cbde776095d7ac53ac693098bda05d2281b4db60904e7d67ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5D 10592 bytes
font_01_sfnt_off0000d7ae.bin
ba748ba79090e2756ac22aa4b0ef61ee90a609dc12ff0309e38af5467dfeb598
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16956 bytes
font_02_sfnt_off00010392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 16792 bytes