Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2eb6c07bc182fe…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 08:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a907dc06c83fa78edaf0ac51f8e64d4 SHA-1: cd49c0ff0cbc5618247dc208571e3e0ad414dc71 SHA-256: ef2eb6c07bc182fefaf01349f135b74927181fdd330c9a7c12ce574c1fcaa8b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=odzyskiwanie+danych+z+androida PDF link annotation
    • http://aotwresort.org/ckfinder/userfiles/files/91356317210.pdfIn PDF document text
    • http://vlajamo.cz/images/file/75233853919.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/374f3d655c5e630def41f1a8f8efa533/38703853450.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4619f7649d1db33e4fb4c263729c0153/7955922239.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38908275926.pdfIn PDF document text
    • http://newworldss.com/uploads/file/4867646949.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/33145125154.pdfIn PDF document text
    • http://apcmagon.com/userfiles/vipojekamidon.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/67344211475.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tugizevunavexavadedifozej.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/57867310309.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/timaxis.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/zuxajulumipet.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161342147bee5e---50228178998.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/zexum.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/86476056173.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/rifolarulabawepu.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/31008403333.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383f5a3f805---xajaxokemuxuravofegef.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/60365784376.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/24145039089.pdfIn PDF document text
    • https://majubesar.org/contents/files/xobexidoladozav.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mozep.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/danoveranugitilosar.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10700 bytes
SHA-256: f38ae47f5da4877582b0522a2514612015d82c1b5afe2ab47671220279b45ecc
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 18020 bytes
SHA-256: 2a784d358675d056a1c4e02899d7d87f226c0bc06ff45baa01f674a3e3a4cdff