Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1ba21271c181f3…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 19:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8faf47e3d8cd6b1bf0670eea057c654a SHA-1: 1eba01656c92a733436710188cfa6aa411f9703b SHA-256: 2d1ba21271c181f355f83fb87cbdd4cf5e06950f75b5988e24313ac0c1eefdfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e24432e2d13ebc190454c9ad48f911ec/4037617331.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4fd3b26c28d909cbcd8fcb657b900bb8/10567853187.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0n2sv7u8kmlsd5b8nojb6k17a2/62977955920.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbe23799ae---getexigu.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/jenuvalifaso.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c733fe072c---woruz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12e58900f---85597767800.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879fcbbb046---35245468996.pdf
    • http://sungsam.net/userData/board/file/zexowopadaxomisapu.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817bdc33dfa---jumelofabozunirelarojir.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8sme86h4kn27j704nb3s80ot99/borugijowi.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v6i7l9qlp0n0m6j3c62dvuksb6/nefudetifivaxun.pdf
    • http://villa-carlshorst.de/sites/default/files/file/2174049788.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sazopisuwozexedevovukev.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/12a570ce84b801ac24bd10ca5dec945a/55656871539.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2c2aa297e151b6a8ecd6683597dadfbf/71537124174.pdf
    • http://adamlegal.com/userfiles/file/riwoze.pdf
    • http://fittbike.hu/files/file/fivajunobipubipufitev.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec24cb81d---jowidugeforelera.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e748092e9d---kodogixadogikepumik.pdf
    • http://cristal-in.fr/userfiles/file/kisabapowaxitunezozugibu.pdf
    • https://eyetracking.pl/userfiles/file/gewidukenupib.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ggf3sn4c5g1ivahtt5lo7j7rl2/kevamuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=example+of+a+reviewed+article
    • 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_off00010b65.bin
f7d721bb90ca898d005f4a2a44e82756f8ed9789ccced577115f1b0992b7875a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10748 bytes
font_01_sfnt_off00012425.bin
f1aaff22361edf4e57719f37e28ebefb8a0f3072993b090885d4ea1748432e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 19012 bytes
font_02_sfnt_off000154b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154B3 16792 bytes