Malicious PDF — malware analysis report

Static analysis result for SHA-256 305e9ff20fd17eb4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 10:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3024f6ae149a2bbd09b436901efa4f10 SHA-1: 270a18831baf175d8da0657272e90f4392f10ea9 SHA-256: 305e9ff20fd17eb4d25cf03ba9df781c7fcd3d0de83e36b486e594f9161e65a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The document's content and heuristics suggest a callback phishing or tech-support scam, aiming to trick users into calling a provided phone number. No scripts were extracted, but the presence of numerous external links and the phishing lure strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=newtek+tricaster+mini+manual PDF link annotation
    • http://www.jindatunnel.com/up_files/file/85283338887.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/lewizat.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210531091451799.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/bd33df116c60f494bea2d377ae4f12df/10692604520.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soropedafusonoxapu.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tosidirodojo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/dikisulodurumitofujakig.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tobobumevelosizi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fb419dfcca30fde0889599cbad09175f/jevorol.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/67794317999.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc7d14d7c---32633804982.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zozif.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kubosukobokaduwanuj.pdfIn PDF document text
    • http://uamarkets.com/images/file/21853961219.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1975e8d97257465540486bdfc1a75d52/tojisikazasefexuvoguluj.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zotopusigupojeresuba.pdfIn PDF document text
    • https://campermagazine.tv/public/file/3989201365.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/fikarubijeze.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160779a57123cb---jopogejonojuliril.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a92e25d902450572cc2a73400def0fe2/fetipod.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dozixogezosi.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kufuxob.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/jugilubi.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_off0000be74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 10528 bytes
SHA-256: b46b00c18f4218dc18a1f4940178246ea4d9a63ea5988be88fb09ae8b60f7c88
font_02_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16304 bytes
SHA-256: 91fd4dfddd353884df5f950e73ad092e86dc17ef033ea0abbd657967ad7a9164

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