Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fbda396ad607d6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 01:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb79ff8ad9c41be06204cba84e1c2d99 SHA-1: 52c19739c7d32ea73db72193c6306ed3ecdb1bfa SHA-256: 05fbda396ad607d6a39da11b811abfeae51d6a7a4810d0cba830d830eb7ec07d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and the link farm detection confirm the primary function of this PDF is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://krisoc.ru/uplcv?utm_term=exercice+trigonom%C3%A9trie+3e+pdf PDF link annotation
    • http://pokemom2.com/uploads/files/sebuboxev.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/33048265155.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/6587874619.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lugezodugolamop.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/faporikadozoxilakepug.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/78468023893.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/24499116634.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/90496000740.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/a3tbfk7kcsu9bdm554g9hc8bdc/wipoponadidubaxeparofowi.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/xifosusuv.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/xowezeralibelim.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9701b2635---dibibobuwumawev.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0mptk6av86eqng2nk3b3bj184l/bemiparajuledowepinukuto.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077768cc54de---90445303209.pdfIn PDF document text
    • http://ledins.lv/cms/file/46225526470.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769e9c9be0---80522076738.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612341088ef36---82819289552.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c009a00a0c4---34132065525.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/vutalidajomef.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/vovirirubuxaw.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c03734a082619c632c10f98818edb058/38849354934.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/bezefatofew.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/jowujamoxe.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/nepolamajegidojapa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a89fbd3512e93c1091323bc5c28eb5f0/xepupe.pdfIn PDF document text
    • https://istanajp.com/contents//files/7055152825.pdfIn PDF document text
    • https://activepymes.com/pub/file/mivikaka.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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 11000 bytes
SHA-256: e36ccc44368501cd4678b05b90b888885a14792bc3e362eaebd0818f311335ba
font_02_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 19760 bytes
SHA-256: e3b8b0b4c3810f4cfb634f33d25bad5c7165e67857108466baae88dc5bec47de

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