Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a263beb9fae8efc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 15:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9e196646e0be42701639c8526bf2f9a SHA-1: 93fcb6dea779b0a7f2f7d15a762558d86caa3e93 SHA-256: 1a263beb9fae8efca59f9ff234c19aff2dfff7b41c7f595ba19bcff3a09c2e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised websites. The ML classifier and ClamAV detection strongly support its malicious nature. While no executable scripts were extracted, the embedded URLs suggest the document's primary function is to redirect users to potentially malicious content hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=can+you+call+multiple+people+on+facetime PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7efa2648---xikunumagevipefonevepoz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145521a27524---76992414073.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/98375241630.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/davixezumutinugaxe.pdfIn PDF document text
    • http://www.agot.pl/upload/file/54873400916.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///53130131116.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/juvuwureliloloxev.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2ccdba71f6f83f015633fe44f8c25fdf/36362027751.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/rutifeb.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/35635771416.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/77742285820.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/gujisezolifoz.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/92699301175.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/jupunedudifezedigozebim.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/gadase.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/ravene.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/34493082543.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912122947402620.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wubewamixafegi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/12569697081.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/36969314836.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/bofaduxulaxiwopevukugoj.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/vabimomudasa.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/11864380195.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/68187490944.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_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 10620 bytes
SHA-256: 640b93aa4979cc69ad486880bf11a7f677014873567e934106c58638b6b8b4cd
font_01_sfnt_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16164 bytes
SHA-256: b21bc99ac8981e7ea54f1b05a645f6153aea84512b470b4f87d707d3551bf50f

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