Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc40e8e54fcd98f2…

MALICIOUS

PDF

82.4 KB Created: 2021-08-08 19:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c034d46d57fadcd191931f8375c33c7 SHA-1: b8a08b11711f0a2f569d1472cde02588f1b03f53 SHA-256: cc40e8e54fcd98f265f9c33226dd748187d8399f037d8499bea4a2350b1f837d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://laborke.ru/uplcv?utm_term=university+of+sargodha+paper+rechecking+form PDF link annotation
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd5b2f0e4---50444310366.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609400c21b2f9---liwegidulul.pdfIn PDF document text
    • https://khanikango.in/file/32779324372.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/28847078391.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tomenedojalolimodidafon.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6eeb40f1---92646572041.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/robokezujipevowu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/68929378625.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/20968783440.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bf394de90---kisulajoxelepep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da61c72821---12999513906.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d44725695ae---19633852066.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/zavemasovitafurub.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/nusaguxetin.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-17/20210517013552895985.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fcd2296d348b11e259cad6689e3a6ce5/witawapotejezotebekarasin.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kisovedozokiforoj.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/29074283533.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608894f7bad65---tikatakeni.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/16314166135.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/romatutukigevivonepimaxiz.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/10704383837.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d487fa73b567209d8177c9ff4183721/15654588829.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742bcc078d6---3211410575.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/rozerenifum.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2d489g1j2m5ljnk5imi78pfddo/burivanezabenujalod.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_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 16336 bytes
SHA-256: 6134d196d4df53d63d3cc1313d7c2d005cad3b2afdadd0b75083e1f389c09144
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 11300 bytes
SHA-256: 63e442cfb9aade01bebe6565d6d9bec9ade8a9166e957ffffd51651ffc002144

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