Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a13b04bf4177502…

MALICIOUS

PDF

91.1 KB Created: 2021-06-26 08:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd7edf4dc41f8aad24d241a8bf778081 SHA-1: 7ff7954e7601e2cd258590c2125e3ccd3f61079b SHA-256: 5a13b04bf4177502be48f773e911c67ef8dd12a030f90228a43f492367b4ea41
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to trick users into calling fraudulent support numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=henrico+county+inmate+search
    • https://anukulagrotech.com/userfiles/file/gizojid.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6141c510b9---95209095893.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6745a3300a---45189725762.pdf
    • http://sgpeo.pl/users//file/risifodunerebemutozu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3idh0a06psbs3dbrqkdl35g577/lavovasorapuxogipe.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609888b72a809---sutewijuvedija.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1075ecbd88---50234789771.pdf
    • http://collegium-connect.nl/ckupload/files/95852005652.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a679780a---gotakowadodubekofadowo.pdf
    • https://efficimm.fr/userfiles/files/lexiwogiriwusani.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/donagavaxatil.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160829f29ec314---mubamamowivomiduzarek.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f1d77d606501217aba8db1dc7e43eb0c/nupoxo.pdf
    • http://chickendaylacrescenta.com/uploads/files/98799315767.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27e40a01f---zetadidawedaf.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9bdb84a406e97fd8a2bc685b4d5d110c/dugeridutuketuriwuvedup.pdf
    • http://balogmihaly.hu/UserFiles/file/41745988993.pdf
    • https://makenie.com/upload/files/62139939318.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jmrdfltbdc141m2i9apcoesh78/12196170830.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6737feb614639afd19c2d66c4d462846/54017145707.pdf
    • https://fnb-concepts.com/images/uploads/files/35645244108.pdf
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/figixinavafetufijesuzipi.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c4e7b85d---ponawaxatolasexi.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0a8939c8---sunodajipapilivaz.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a5835b61f2fdcdbcdbc70d5076127aa5/ronufejerilet.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_off00010098.bin
0b6da462435ecda5e44801735620761683dbc4478a358ea7c4146551504bee6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10656 bytes
font_01_sfnt_off000118d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 16792 bytes
font_02_sfnt_off000130e7.bin
38cf66faf98b069122345605fede42f7aa01e2038fed35ed373214b68ca58b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 17620 bytes

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