Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b4b4211753fc2a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 13:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd2bd929a66a3eecdad6945eae7a4c1f SHA-1: 7771d92174be25e92d1c3a8286ac21e983400f1a SHA-256: 49b4b4211753fc2a23c8c8612ae745bcf2c943b5752d6262ece597ca60d32abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=marbled+paper+its+history+techniques+and+patterns+pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d1b9c082---tazumipulok.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/dafojezamozej.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ceca8e6a0f3c4c4b7b0fa7095cf45fec/nuligulixula.pdf
    • http://school15-tyumen.ru/f/82075107230.pdf
    • http://tikatalog.sk/_files/file/75778006799.pdf
    • http://agrobud.net/uploaded/file/806200659.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7d51e6526221005998b2cda277c4af64/67908500068.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c622990b918---40367877611.pdf
    • http://mingmitrcoffee.com/user_img/files/84390313983.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075711e2278c---xavurodozeromisajogexoj.pdf
    • http://ac-kenigsberg.ru/files/file/ruzovavow.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d30ed18c5---57939345713.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7553jp7lrhpdpqma4sftuokfk1/76142955009.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985c58889d4---gitonozotefasetew.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120dbca93271---29383611496.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9d6c12e3c662e19bb3b31ae4b21df302/89128868746.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/pifm3bume8rg7ep61q5fk1sqo6/77899258942.pdf
    • http://wtmongolia.com/materials/file/jepegoruniroxesitogagojo.pdf
    • https://amd-export.com/site/upload/file/janiw.pdf
    • http://ndt-ultratech.com/files/luxelokiz.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd5717e43---22548742069.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d38be32a---dodutojedelala.pdf
    • http://rolmech-strzelno.pl/Upload/file/linipo.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_off0000c4a7.bin
cb3235f910e9cefc46aa4c5e42248434b8602558d6c69cb06cbfbf93895a1c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 11208 bytes
font_01_sfnt_off0000de70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16792 bytes
font_02_sfnt_off0000f682.bin
5a49958ad0f71ea2a7cb77a2ed61721b06f3fdd887acb385ff009d68d9c3141f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 16944 bytes