Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5f1e5b425dae11…

MALICIOUS

PDF

88.3 KB Created: 2021-08-29 16:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 772035fb6bde333874845c54050a3513 SHA-1: d6e7104242c72313baaba875d9277b8adf7d85b8 SHA-256: 7a5f1e5b425dae11b49046b579cb6aa9e6c31a4798d6acedc4a9235405a5cb4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=cephalexin+for+bacterial+infection PDF link annotation
    • https://leosservices.com/userfiles/file/gebesanufedatubakogu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wodudajiwutajipan.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/jujenutuvoxegomuxabu.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/69901270359.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/79649030353.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/batutibetufanarexuvidub.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3c5309257b85f1aff5bc5e0744c44d19/gavowedabu.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/95838139825.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/3130898827.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/sepepabuvodozisuz.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/27892113347.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/tidel.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/13880039213.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f2021b8a625633968eee57aa3368ea73/vowadipomedovoj.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090af2a24e4a---melis.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0edfac5f4d093e74f8477ae591de1a53/94700761143.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161255cf19b462---2851902387.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c9peks05qs6co4e7et4vcnkup2/tififowudi.pdfIn PDF document text
    • https://swiz.eu/files/editor/xisudukurisefuju.pdfIn PDF document text
    • https://ksa-machinery.com/images/file/pirubulojuxexe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nn5to4na61rk6r6nle04l3ik1g/14040393936.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ke3s6ih37710uo2cl2damieupu/65715800994.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/edfa6d6fee2f3d29e4fabab886852cbf/43890977811.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/medideraligegegatuwaraga.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kelovivojomopefifawe.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_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 18864 bytes
SHA-256: c3da4a1689c96c2d50a4fd39bc2d39aacdbaa22d06d66c64930fe67f7b30114a
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 10680 bytes
SHA-256: 8c9ce572e8a8be3cdd630dfe51a299b9a5423e468a83646c4c2811569111e4f9
font_02_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E3 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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