Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d44460019ce34e…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 03:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 657005da6487285d07f3ae629d242bc0 SHA-1: 941c16304e129ab39cd0c24c25b23d639bb38756 SHA-256: 01d44460019ce34ee78f099329c5871ed726244ca82f2e4fe02713461fa7ab0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains numerous links, many pointing 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 an attempt to distribute or phish via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://goldenteriyaki.com/uploads/files/lutodetikox.pdf
    • http://hig-hegmann.de/userfiles/file/tuvilikibimelewotijok.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/sixib.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/p0ucp38nrbrokmei3qben38327/ximununumapibofodaj.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/rekufejokedotiditaximimu.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/52528127422.pdf
    • https://ourlady-schools2.com/userfiles/files/7979586747.pdf
    • http://siltherm.com/ckfinder/userfiles/files/kafoteferewilo.pdf
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/53037023996.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/laxonaz.pdf
    • http://chretkinia.pl/userfiles/file/potavinorawibedoranu.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/96298665986.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/afb4cd4d0ad841b1f6258475ad150ad7/39668971029.pdf
    • https://patriciobanados.cl/upload/file/
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e301059284---11436029082.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7710e8ade---10916553394.pdf
    • http://poltinik.ru/userfiles/file/pegowamolefezoruno.pdf
    • https://aawyx.com/sites/default/imageuser/file/lodamumimabewobalololu.pdf
    • http://slavutich-media.ru/userfiles/file/kegak.pdf
    • http://zabradli-znerezu.cz/userfiles/file/zuremume.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/68261261768.pdf
    • http://koala-al.com/d/files/5222746896.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=como+colocar+android+no+celular
    • 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_off0000b266.bin
b5d952778bb71ca5c09d4bd5738dbab6a2e8f38d860b32291ee95f7fca5cdb9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 17120 bytes
font_01_sfnt_off0000ddd9.bin
d1b606d030657f75759969fb3ba522fe0078930ce1e9f0392ec5aa4851e621e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 10396 bytes
font_02_sfnt_off0000f54c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes