Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c92e88e5b56d8cb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 12:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fda16b81f1537c695d47e88200fbcdea SHA-1: b55a0e2e54a24ca85a6bbcabe93e6436baca314d SHA-256: 2c92e88e5b56d8cbdee246ea6b8b81cb6ec12282ac15bc46a6d9730e7acf616f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to obscure the final destination. The heuristic 'SE_MFA_LURE' strongly suggests the document is a phishing lure, likely attempting to harvest credentials or abuse multi-factor authentication. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://ketchas.ru/uplcv?utm_term=apple+vrs+android PDF link annotation
    • https://turbooto.vn/upload/files/rasawesugutigituvi.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/xaseluzugojidaber.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d63192af7---62184082860.pdfIn PDF document text
    • https://claudiodituri.it/uploads/xosagotivozuverozipisiviw.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/pelavujabuzepibawafedol.pdfIn PDF document text
    • https://duel.pl/userfiles/file/3838471763.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/ratalenituxafo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/15029728850.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/28240350349.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/lubezifefekobaloz.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa81bf4d1---90769951039.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/37608262586.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ca62837d3e69e3a8bcc280675d1c102f/pabuguli.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/korazudazumib.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rujuzelejebosogal.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///wolugabuluzetori.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/nukomujeretukule.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/wotovib.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/pudoxa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5517ed4175444a33db242651ed81b960/gowifo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0960968ffb1131b3238531ded34ffe69/kajemoda.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/16398052724.pdfIn PDF document text
    • http://dsraxys.com/uploads/faxinurajabaparenunuko.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/61437320967.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_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 17968 bytes
SHA-256: 6dd6068fb2b1fae1c787bd0c06478de2455d78161a3163cb507b15340fb93973
font_01_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 10336 bytes
SHA-256: c06410074039e0ee6e12c7620fcad9316c6a59150520c721058280bc9013b698

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