Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddcba60357cca6d…

MALICIOUS

PDF

121.5 KB Created: 2021-09-06 08:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfe61ba05ed7a0d55debca339aa7e56a SHA-1: 702c26af4eaed1bd7ff09753316f80afe330092d SHA-256: 3ddcba60357cca6d1dbb9e93b6149fdd908b4f271e5faf625b0202cb5f4e0fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=women%27s+pdf+sewing+patterns+uk PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16100fa62ed8e1---xaxifuve.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/60889200768.pdfIn PDF document text
    • http://polkovnik.su/upload/file/66722553773.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vimizizofebilupelipetuk.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/4f0885e2eb5c0748a39e8de6e92be9d8/mefigoloba.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zakuxaxavajogugoji.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///50272049123.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/uv725kgesnvg7m50n2qhcgvr55/67681085429.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995fee5025e---54575692440.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb9aaa00d6---8958434710.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/fudabixu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/87470990062.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/76154268712.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fanokidazikive.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711810992f3---xaxavivutaw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c83db28dd8768ebee9736f6e838ad42b/sodiwanuzabofiv.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124cea038d43---52709753814.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b2aaacc8---34313526278.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/begexibezanuz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k97drjogh9v2r4vbt08tr611i2/linanavo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2094628de0cb27503890b2ce447f7679/84522010485.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609935338633f---tobet.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/jazozu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/mabasur.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fa2cb6211568b499e3cc65c13cc7572d/runovapogoluxoduxo.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_off000176a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB9 18188 bytes
SHA-256: 6c624e5b83a6722110ee004cf562f0cc7f71c8db92318c5270841a609051817f
font_02_sfnt_off0001bde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDE7 11100 bytes
SHA-256: 5f16f9141f4069e5dbce3d050cc5370841fe36aafe8a176986a730caaa5b94e1

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