Malicious PDF — malware analysis report

Static analysis result for SHA-256 89638e803c7de707…

MALICIOUS

PDF

87.7 KB Created: 2021-08-18 11:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e4ef99f7613d496a600ba9a4431e40 SHA-1: d90849e88b1c1e317b8aae6b151bca62b1cecc1b SHA-256: 89638e803c7de70786c751018241026da7660e2a7795d4652f3e438548ff31e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48e410425---javevo.pdf
    • http://aylincinarli.com/fckfiles/file/92526489081.pdf
    • https://polnische-zaune.de/userfiles/file/nirolotijifenakapumaw.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cq0o9vhd82h9a26lu4bhlqd24g/zukazurusupedajeruvef.pdf
    • http://gandolfiarchitetti.com/userfiles/files/84506485248.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5a2a50cc7b517bbc61ef78237742b070/bidaw.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902629c84f---67996333566.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104ebedbc2a3---77696964077.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/71220761217.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2b95f1b6---muwopogomemunifixelig.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qcd8qelf89mv6jkmbjf6km1k6i/devinug.pdf
    • https://kawanmto.info/contents//files/41678543902.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/emq30rbh1a3lff3a42q3s51q9o/wapataselefubuxumizuxesi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0dd5dea2042d863cc9a9d5ad68177fe6/gaxikurivesujeluto.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab8255b81---58392553801.pdf
    • http://agataklimowska.pl/userfiles/file/47265712427.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/87355938136.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eae2191f0---sununepeg.pdf
    • http://hillandcunnreunion.com/clients/864369/File/bakonopeguwuta.pdf
    • https://sthouseluxury.com/upload/files/2400882110.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608412670a935---wiboxutugusigojig.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/50325703091.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/60453373272.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+program+hunter+indiglo+thermostat
    • 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_off0000f3ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
font_01_sfnt_off00010bfe.bin
bbefa4f84c6819f61e1a3edcd0f521cb832ac01a61d7b4c4c2c3e31b4cac1b5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16768 bytes
font_02_sfnt_off00013747.bin
226085719d924f2c55256ef7d9de534c75b9800fe86bee99c50b5ec6368a4f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 11016 bytes