Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9e360b0facfdef…

MALICIOUS

PDF

169.0 KB Created: 2021-08-01 11:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1876df482ffacffbdaaa71fa15f4b116 SHA-1: 091929979a9b7ccff4400b70880d96b88898f334 SHA-256: 1c9e360b0facfdefd1a7c1d90cf39c9abebaad5d10763b576334532acbe6541f
136 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 sites and disposable hosting, indicating a link farm designed to redirect users. The 'SE_MFA_LURE' heuristic suggests the document is part of a credential phishing campaign, likely aiming to harvest MFA codes or session tokens. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://pistant.ru/uplcv?utm_term=how+to+turn+off+call+divert+in+airtel PDF link annotation
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/89fe8ae98a2a2378f26bff83c8220c14/gipumekaripumopebetazi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92a23db3f---fomofotanikimurasexurewug.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zijodokofadelirelok.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/os254po3dibqq57bcicn75r4q6/sinobes.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d716ecc2258a0124bcf3b6e016a3a9a5/25414190822.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o2nd1svk7goi5k3pburoa9kt8m/76133243336.pdfIn PDF document text
    • http://amandamaitland.com/images/file/54777457320.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3d44e1feb39ac704b5851b1ae99a426e/sesefamudumulijib.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cd5621b6ca3962dda28944da87e73dde/tutatoguvinakowidapuwubuj.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/wolupenivasoxil.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b393f900da5---gemenalapopasugawex.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ebc9061f---goxiremenanexuximitug.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/813eced39877c4fbc3701727d483200f/nutivosefoki.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6936aabdfe49d36665d3c64021fba988/tewemakinonalurifala.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b81de1c93---58797113038.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/ruzukexobubujerujomu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1o58tucs0hepnektiq297jn83s/lamug.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/tuxonofijotadego.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/kedukunexanak.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/makidatapuxi.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/3600112637.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/71722298849.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e010f128ce---25462847081.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607813ef3248e---2084004604.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/ravorirezewuvaze.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2339E 10544 bytes
SHA-256: 0fbad437f6ecef07066bed752fc83f9df06f9f4cf95ee6a4f60f7c799d270c74
font_01_sfnt_off00024bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000263da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x263DA 18396 bytes
SHA-256: dd45ddf78210aafaa987a32daec2599e12fbd701ba3368d12e6f7bbb8df8de0c

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