Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c9e3ab5d53d334…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 23:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17e4ac068b11a0cd7a46c5d50a04567a SHA-1: 994a9067e27b6da9e203c6091ffbbf2951da645c SHA-256: 12c9e3ab5d53d334217f1dc78ccf005b93ac719536ea532ee577b96e2830a98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=silent+night+jazz+piano+sheet+music+pdf PDF link annotation
    • http://www.thaiboat.net/image/upload/File/titonotenapaxidogub.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/tetudixis.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/96003446559.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/tobiboxiraju.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/gisitewavojebaxipemamamep.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/mijanigugijabesefem.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/gowesiba.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gosepukonuvumuxep.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/36931f6a92eff332ae92e8b2eebca47f/47795328840.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/zaxiwig.pdfIn PDF document text
    • https://highrise.pl/file/75322511897.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kokisuxipajugufitotanumu.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/81212564218.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130af575fbef---galuwakigezodasipe.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/14931207144.pdfIn PDF document text
    • http://prograsifkalip.com/files/guxixiji.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/mamubamigovazorawa.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/6624892608.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c67f46c11---60323056723.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/844282604f4f60b46c3fe664e41de6da/kipujegozulurukaxonig.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/74084380459.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/fejujotiwaximifa.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/70088464668.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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 11332 bytes
SHA-256: b04e9606f9d682fe3a27c70a64ac5c41a9c76b3ea944dc51827ef19d6757e1cc
font_01_sfnt_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 16712 bytes
SHA-256: 4c3d42cc414a4bd2e5c287aa0c9f6bfcdc315fa7b96d42b0ba4d5c4f4126188e
font_02_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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