Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dfe62ad2855b50…

MALICIOUS

PDF

102.0 KB Created: 2021-08-24 20:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e116c669f4c326baf050be8ad06bb674 SHA-1: 2e7939697ad817861865390c4208132871496393 SHA-256: e6dfe62ad2855b50114ec376c5ef4c8a4bcaa5f6670fda700f55c38c1a604ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of numerous external URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedef.pdf In PDF document text
    • https://lecachet.fr/docs/files/65669961479.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/misibaxip.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bb5a09b56---99218704736.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/joluwupukimofato.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/65480220418.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/78q6724i0b1kk1520r331nrm14/jadoga.pdfIn PDF document text
    • https://digireg.gr/upload/tevobawozomuvanofimifi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f7553b29d---borizegefajoxomogupepe.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c229775bd---febuwu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/56395214860.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/fb277345fd7b4145aa0dfc4ec4f00939/89571425879.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4953885791.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210803065237.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105d4854fe33---kipidibonumunupe.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/kisidabedaxoxebaxazus.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/dd5f0dbd7c4c29df575253f1acd8d299/66970824607.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210822_060202.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072639a17d46---pelumopu.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijarogefef.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/351851723.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6362762a---99119953953.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607880656016d---40155671027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pdf+family+and+friendsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 10412 bytes
SHA-256: c645463f66c3068d0ac160b6eb553e066818e9aee57c23a3f8302fb70a4e2f58
font_02_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 16792 bytes
SHA-256: 81d2321875d34172226ca73409034349525f07f3a30965ca3b64817b2dc03af6
font_03_sfnt_off00015ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA7 17072 bytes
SHA-256: 056cff2e87759150b604acb19f93074e1029d3fb42c57996378d2584e1ac0dbb

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