Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad299bee96f649e1…

MALICIOUS

PDF

86.3 KB Created: 2021-08-06 01:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63f72a8ce196694b52897cfab3c638ee SHA-1: 4d0a3f672d6ca9fee8ef5a76c6624349710ad236 SHA-256: ad299bee96f649e1217f9b5d649683c5048b231d90bc9839a8b790e4f13896f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c646f19edd9---5445773487.pdf
    • http://aven.su/userfiles/file/nowares.pdf
    • https://mamo-tato.ro/userfiles/file/20732797376.pdf
    • http://pospatrans.cz/UserFiles/File/nixepaponafafure.pdf
    • http://pytextiles.com/userfiles/file/rufatekuxejisigiran.pdf
    • https://autoskola-scp.com/files/vazidopilejuwutefozorosu.pdf
    • http://yossy.biz/userfiles/file/77330471625.pdf
    • https://ascinfratech.com/clientprojects/trading/file/derujo.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb722d0a1b3---fujitevimuxumujudibus.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c92198cfc2e---gojofax.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be380bd4b0f---lebidexobomizugiwusotu.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/futasidivijileposuwo.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2d534a703d2b9a033248e234877cdaba/dovajotexibugo.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/kagavogorexitulozar.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dotetozapadopatoga.pdf
    • http://n2nlah.org/UserFiles/file/17819617987.pdf
    • http://startmatbaa.com/userfiles/file/jimilodapujasepexo.pdf
    • https://sportnazona.bg/f/uploads/files/tobuzixaguk.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9841b023---67840348567.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984458aff18---kesudixeladedalefewuda.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607278fdb0912---gowododizojurewotul.pdf
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/89852660793.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=periodic+table+review+and+practice+problem+worksheet+answers
    • 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_off0000edd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 16792 bytes
font_01_sfnt_off000105e3.bin
c686c694cca0df9bc2931af466d2354d9f7218afb4a174faa51a8fd3e274d01c
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 16664 bytes
font_02_sfnt_off0001312e.bin
e187abdcd4bc811645d3c703424e8cd4ec67f326c8362986c625438e1ae26361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 11164 bytes