Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7a8f3af365d911…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 12:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bfe2a24f0ae650be070389e4fec1780d SHA-1: 33460cd225d8b26365f19708087b7f687d17e5ad SHA-256: 6c7a8f3af365d9112d1fc49b640f9eec70ce0f1e12e001c7596edf1103e4055d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=correct+the+mistakes+exercises+elementary+pdf PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3d2a06fa8d02f750fc44279fab76972b/jupabobopupigipij.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f37d1893a---36874618499.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bbc852df3---masodel.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/nutekawog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c032fad9a02---95231258388.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160857b89b9ef0---1567718370.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67a30b7dc---62461524152.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/puketezopetit.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xufez.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/uc1pa50c919vmu4csdvseuvqrb/zogefepipugujuposaru.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eba27e4dd---pojewevaxonidozuledezad.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/namodavizawafan.pdfIn PDF document text
    • http://ecole.ru/text/images/file/41198953772.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/lidikepizumipabuzurikiji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4i77fl5sfql60i166aok9tokad/49865157589.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cda1a8ece3f1eea870738058b575d905/86727063009.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/85521236111.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/51298902996.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/80145775181.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a57627cb21b---rafijapukopopeg.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/54335307973.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/vevovepapofegu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zepemazelubifarekodetu.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_off0000bc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 16832 bytes
SHA-256: eba562351495935551be3f6418a1b15704c24515369b03cea3e50545b2266f31
font_02_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 11224 bytes
SHA-256: 1230f3461e660895c70b17d98784f3397288dae27d2b6b3a0afab3be9cb5e956

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