Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4568125ae5e7236…

MALICIOUS

PDF

82.3 KB Created: 2021-06-30 22:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d148ff0bcb7174cfff4cfbc5ffa64ef SHA-1: 3e268676ee6d17d90c4fe24374ad8c5c62a39b10 SHA-256: e4568125ae5e72362c6b9568d6e948a1e1ebbd8ed8c2727f3c521b2334c72c02
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of compromised CMS uploads are common tactics for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a875c3be614---84408975842.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/t1jtdgcnlb3d1vbcltcrhopsa4/nuwonani.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5aa8ca0a89e6d6003266025331ab853d/88157561851.pdf
    • https://airflow-skateboards.com/upload/file/sobidabarar.pdf
    • https://lepjunk12.hu/uploads/files/sefabe.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/lijuvu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094097e5429a---85772708023.pdf
    • https://angkalaris.com/contents//files/19495742143.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ba1819ce8e964fbccc7b5877aaef79db/84379148539.pdf
    • http://sgpeo.pl/users//file/95976037593.pdf
    • http://offerseir.com/basefile/offerseircom/files/5379293833.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wixinizowexog.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/offe8k1b7h7acan5mp7feghlcg/gejelikegarofukodagimofer.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/7924096945.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e605c1d6---80919221550.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a36738ef---rovuxezatisewumewanite.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a241b7a49---jikimesikubisovomewojaket.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/velajosirefuwulorelokovaz.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ed1864df---dibidikotozibevujejotuxus.pdf
    • https://zoldlepes.hu/userfiles/file/bewijunidusukuwuxogiwaj.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607be60e4354b---nabevawesobuligowita.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/35233269438.pdf
    • http://cuacongtrinh.vn/upload/files/vuzufonisajawilodejetogu.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3313fd1df8---89220889686.pdf
    • https://cafepiolho.com/uploads/assets/xebizutoniwup.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607754f988201---lejudup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=five+foot+two+chords+ukulele
    • 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_off0000de3d.bin
f1a415c15b72cfc4dd8f6d1cb6c924ec58544cfaba4a9180f613b761ad4b73cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 17312 bytes
font_01_sfnt_off00010bf8.bin
26b3697dd95235ffa73f2c73d99d29b3fa16bcd2b5132c783a2389c53f90f17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 10628 bytes
font_02_sfnt_off0001247d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 16792 bytes