Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e46be0d43812c67…

MALICIOUS

PDF

94.6 KB Created: 2021-07-07 12:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 82b42c29ebc97ab523df5a447552dd55 SHA-1: 8464dbfafeaa8a366d06c496703e4271ce921902 SHA-256: 2e46be0d43812c677826d574e0ae45c1d61cba997094fefb95dd112ae5ec4f56
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=mendzs+freight+forwarding+corporation PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e3c0d717---24754655981.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf88db4bf---weduxulonozosexajino.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6adfbfb4c---puwiti.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/91314850321.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3f5a55c5c2f8209c67e63a2b558697e2/zarosabojasonujatiw.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/77452801150.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa5121ab5---kuxefiketowajukoper.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a5j8jh4nms2qftu6t7ih1gev57/solomafesumikorilevidu.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sinoligowewewet.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/19309359048.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098665058602---zuxoz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d7e31776---84544889341.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21070422001453017289ifhl.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2436355199---93572297675.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/96023421592.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/347ad867183d3f35918cc93e2281655a/gimugabut.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/3b6fca3488810627c14e70f8164bfa53/sitegitaxopufeduzili.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dc89fde38dc994596b7eb7e63342b627/jaxoloxunemojobule.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/97625438198.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a9d32f3713fd02c3a06ea649a22ee049/23198736617.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 10992 bytes
SHA-256: ef93bc5d820c24e86e35e533248486d6035bfe87ab32d3bbb4f4365b623ef70f
font_03_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 18632 bytes
SHA-256: 0b6b0dec91485f8b1aded0ec2644d53861135e7bfeb45e10e8f472e631fa5555

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