Malicious PDF — malware analysis report

Static analysis result for SHA-256 056ab66cdbbb2aec…

MALICIOUS

PDF

91.3 KB Created: 2021-06-28 14:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041ab1a09291e9f44e3fc56a1e35c010 SHA-1: ac4f3e05d739b71bd74fb308d309a9f19983763d SHA-256: 056ab66cdbbb2aec64c3241ee6b255fdf40ae10dea20845717812373b990e222
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://commsoft.nu/demo/ktb/wsmbilder/files/naresof.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/71355008674.pdf
    • http://fly.no1-yes.com/userfiles/file/tozawowifimotetotofi.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/to44rnilhainprqgfgmtcoe3fb/90464854620.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d17f2be9c---guvizalugaf.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/i2d2335gdahu3bf37up999t1t2/17611341709.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c53c615a61d779f784e56d6cfbf232fe/21362028501.pdf
    • https://viboot.com/ckfinder/userfiles/files/78093748776.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/66663495929.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54256d739---sabewiwinuduw.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894fa73d798---jujixukol.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/95809438842.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e5c27d50---91835423110.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/21c3bc79d501ed8321bd87fa2b889ac5/rurabekoxoli.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f3cpieiu18q2b8qbtkhkmmhrl3/kasigebefojasilipamaban.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db0332e69---wotuxejuvozuxazax.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a356835988c---55335380397.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/42df53082c66be48bd7a691c2af71914/keronilakorebiluleg.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cee679a547da4adac5eb955f6454c41b/96672214737.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=new+year+monday+motivational+quotes
    • 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_off0000ffb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 16792 bytes
font_01_sfnt_off000117c7.bin
f5e42a1fac564dd8cd0d5d8ea70a8cb1e11dee8e5e0da0814e112dab755c78d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 17616 bytes
font_02_sfnt_off00014578.bin
28ee03157785eeda0caf8f5feb812fa3429979970ac563f9e20f6150a41ad995
pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 10896 bytes