Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1ed3c403bcdc1e…

MALICIOUS

PDF

76.6 KB Created: 2021-06-28 13:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdecaa4b3b399d454f47a175e29701b9 SHA-1: d01c9421992e81a81a8a7e24d8995a5481a7093b SHA-256: aa1ed3c403bcdc1eb202e17ec9b27907859d1790f5759f75ca252d229a843f4e
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 sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://pixomot.ru/uplcv?utm_term=move+the+needle+synonym
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bc436732e3d0c5a96360c1d4be54e515/27987728669.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6a1ce71c1fd1fbedc1bfe6324e88ac9c/6550187406.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/28a869c2064635ec1031258c874a569f/fokupu.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818e76b8ddc---51688048515.pdf
    • http://jaika.in/images/documents/files/weluzerudepafelu.pdf
    • https://seeandhearbetter.ie/img/shop//contents/norigarizuvikasog.pdf
    • http://dribblebar.pl/userfiles/file/45030301361.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ce1e00lh8pki7hdrgd700jhrd3/64261368401.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55fa87995---41202503702.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95bf32c668---93480420437.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2se1m3hats2p7jrs40ubqmvji2/kanuxolibekimit.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5be760faf3---97165192197.pdf
    • https://peilimineko.com/userfiles/file/pareboki.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bfc67ee3---56198513202.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b608bc72e6e---19893256127.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb6acc1d9---29214741349.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607db791527f7---24478021919.pdf
    • http://lnshiyue.com/userfiles/file/20210608235602_1588090761.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0519f9d8543828bd39d0ae477f9de163/wawosoxijepuguxa.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ade6f36c.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c520bab24b4---81822412846.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/kokitelamitipajukusibifig.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814852a27f5---26198782116.pdf
    • https://swift-tw.com/lcc/upload/files/beganibizitenifufan.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d468e88cf---wevejebopa.pdf
    • 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_off0000ca53.bin
55f1195e7228d485be6edaef61fa8943f30c9cd33daec64699a9d1bb0afaa64d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 16712 bytes
font_01_sfnt_off0000f5e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16792 bytes
font_02_sfnt_off00010dfc.bin
8497e2df2054cb0af50a9c0c046325624aeeb5f2efee6b674aa7a1444cbd15a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 10332 bytes