Malicious PDF — malware analysis report

Static analysis result for SHA-256 862ac34fe5b8364b…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 18:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaba1589ae1e9a1385b71ecbb72645c1 SHA-1: 55ee5c3268f1227742e67cef0a8d08e95b91c974 SHA-256: 862ac34fe5b8364bebe09d04ec198aacfc6e526e06d61195341d687126cf37ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, indicates a likely phishing or malware distribution attempt, potentially leveraging a compromised CMS for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c986e7126e---88900787678.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/93140c1df5f398777d3eacfad4ddd5ea/58392137150.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c252de9c6ff---jitemu.pdf
    • http://dzbnf.com/upload/file///41231004500.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f842384de95f440bb74f2121c82f76cb/3936167151.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/xezajitareposujafunomugij.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e00bd511afe922f55b25ee14c88decea/bufuvidasubede.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a011ba6825e---6361223376.pdf
    • http://4grd.com/cmsimages/file/36194713566.pdf
    • http://thietbiotovn.com/Images_upload/files/26690993242.pdf
    • http://mikomisushiwc.com/uploads/files/63790606956.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085902c1ea5a---93323202906.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/93484a61495d86fd4c6d7a9f383697a7/90608566701.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ftnbt642e249jmrv6s43cvq41h/79825465853.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aqsgo3apsa86n12vceokgmb8cm/gukela.pdf
    • http://barsugo.com/ckfinder/userfiles/files/nolakupa.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/891d8739517dc7383f872f144c1d09d7/mufuvu.pdf
    • http://ankaser.com/userfiles/file/juvoxitosaropufogokome.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeab6e2cfb---14515403999.pdf
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/42516859987.pdf
    • http://teplo76.ru/uploads/file/vudupogezekevepibas.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/mupirusile.pdf
    • http://piemonteforyou.it/userfiles/file/43812909881.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc67b5dd8---67680763795.pdf
    • https://harrisitalia.it/uploads/file/dabiwupovawoboto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+fire+game+hack
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ff41ae0aa14011fcea6898ce5432ead/wakuzawarosa.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_off0000ebe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 16792 bytes
font_01_sfnt_off000103f5.bin
54f51c06468457c238271df896c048a30fd9a0bdc16bdd307a540356b3fa7428
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 17464 bytes
font_02_sfnt_off000130fc.bin
bbea19967bdf0e191dc9f63e27aec87b7a60280f302c8999f5c96431f6727aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 10316 bytes