Malicious PDF — malware analysis report

Static analysis result for SHA-256 97013eadaab7fcae…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 17:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13916258b8484d4ab8a8ce3736a4137f SHA-1: f66258a2192e88ca2db6b4ca9493f596a9e25b51 SHA-256: 97013eadaab7fcae2981e91ebf1563782e2b90ae05343519dc5416ea99dac522
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the file's primary function is to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://appli-veolia.net/ckfinder/userfiles/files/limasekix.pdf
    • http://mtcnx.com/upload/fckimagesfile/6363059030.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dfde4eabd46e5e445e1df7e95f07ba8b/78658989021.pdf
    • http://dataprint.ie/uploads/file/jupusojuwuninoxigif.pdf
    • http://swaarm.de/app/webroot/upload/files/71146644666.pdf
    • https://thietbixanh.net/uploads/files/95096299757.pdf
    • http://synthecinter.com/userfiles/files/21390240761.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96077b390---56321286832.pdf
    • http://alnoorcity.com/userfiles/file/pewesigezanitosot.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404322b1204---76885276633.pdf
    • https://kalitelivideoizle.com/resimler/files/84217521698.pdf
    • http://jplus-ag.com/upload/files/BodyFile__613E3DBB430B1.pdf
    • https://ambulatorioveterinariosismondi.eu/file/zujerapomuguseta.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9ec5e24fc01710891b268677d4d0b298/datuwegenorawofejojuful.pdf
    • https://kawanmto.net/contents/files/86117610734.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/63610724376.pdf
    • http://bioaec.com/userfiles/files/tanobuposazugur.pdf
    • http://bubb.cn/up_file/file/pedefusa.pdf
    • https://sakura-bashi.com/uploads/files/202109120950571900.pdf
    • http://dautuck.com/uploads/userfiles/file/xowot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anatomy+and+physiology+patton+and+thibodeau+10th+edition+pdf+free
    • 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_off0000abdd.bin
da436d9e2c0861061e8407046bd5cbd81c8a19be11b550518d9dc68f0aa48f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xABDD 16416 bytes
font_01_sfnt_off0000d5d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 16792 bytes
font_02_sfnt_off0000edea.bin
1e2753a7e09b48181f7db3c52f5b2f8db941ebf6da23086b43f423960a4deac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 11452 bytes