Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd7a38fbe6fdead…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 02:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e86efaaabaee2b042c2d64a2d3f4290 SHA-1: 25340978ebf8d95f01c17922d1b581cc7a2f74c8 SHA-256: ffd7a38fbe6fdead92f95ea1e074e2a12401fffa47b18cd9ce3ccf5082d62899
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also hosts a link farm pointing to numerous PDF files on various domains, many of which are likely compromised or disposable hosting. This suggests an attempt to distribute malicious content or conduct phishing operations. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/76446052604.pdf
    • https://nucamsa.es/userfiles/files/65887775038.pdf
    • http://eqletstalk.com/uploads/files/202109171535104231.pdf
    • http://ahknchem.com/upload/files/fidekesad.pdf
    • https://kccegis.com/upfiles/content/file/20210917043659.pdf
    • http://to-tuong.com/media/ckfinder/files/pomopixakewizapepepok.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4a825c62abbdc906cc0f331d9c063880/34742755923.pdf
    • http://jakpaisanestate.com/images/upload/files/govuwanezaf.pdf
    • http://westernstudioservice.com/admin/userfiles/file/90414841697.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/6439386019.pdf
    • https://hoavily.com/uploads/files/74630068696.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384b4119edb---fofozutugesuz.pdf
    • http://daieimotors.com/js/upload/files/85280980900.pdf
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/guxipofuzuvotabogu.pdf
    • http://superfasttv.com/uploads/files/lomuxemep.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/futijejoxaki.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uj2d4f75nrlmssqrac2on39rvt/guzizemabegek.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb239095bd---pexusulusupareluxuponosa.pdf
    • http://dulichtantai.com/files/uploaded/files/vuzavifadufuleveni.pdf
    • http://bpsstudio.hu/uploads/patulebafinevasutuko.pdf
    • http://linker-apps.com/files/vogepidazimunizafa.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/45749919824.pdf
    • http://musorcentrum.hu/files/article/file/zeturugujugomobitazume.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chrome+exit+full+screen+mac
    • 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_off0000dd75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
font_01_sfnt_off0000f58c.bin
ea138451958afe91e158f7d065b474ea86c55128477451013987ff102fccccf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10836 bytes
font_02_sfnt_off00010e6d.bin
e5779d29903abea5349c26b2b7b68f27be67f63aa80477137d2814b16c7c37f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 18508 bytes