Malicious PDF — malware analysis report

Static analysis result for SHA-256 c567ee32f8916ad6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 12:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b5d8325663646398654a77bca69d8fa SHA-1: 96d773aaa3f013ed83e314d284c9f0d9af76a217 SHA-256: c567ee32f8916ad6709d3bef87168a7bbcb5963680e73cf2e641054b4354963e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting it's used to distribute further malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into calling a malicious phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://corcreation.twbiz.me/data/fckeditor/files/20210913_002813.pdf In PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41877516.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vonanezuzanexo.pdfIn PDF document text
    • https://advik.net/userfiles/file/44534346451.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///fisubinukokapanopetav.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/91338984036.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/fedudikurub.pdfIn PDF document text
    • https://yellowstonewildlife.com/vemitav.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/44138918288.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sujofufitufogeriku.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/51153009813.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_3E51736AF5898DF8.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/52650621188.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410c1a7e5a0---45130704545.pdfIn PDF document text
    • https://blokhol.com/upload/files/nofipeve.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655c69e52a---34041387263.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16146c98d2a3fd---butivajubakogubi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/12460195603.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/90265684491.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/53424123307.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16135afbbc6409---1306154592.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/jiratipagoxodevuvomep.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/84821943700.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/85422479319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=american+horror+story+season+2+freePDF link annotation
    • 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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10768 bytes
SHA-256: e45f2eb0fe37b264e747564737d551e945da0c90dd6438414004bfab3d54a569
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 18800 bytes
SHA-256: a47155224c14372fd73a125349da2831bcd32165ea1323839ed1182ae335263d

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