Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfac3d9b74ff247…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 14:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bea64a62bb3b1225f94df2523a3c8362 SHA-1: 076bd01db063296934b479b347b4eb02109b36f3 SHA-256: ccfac3d9b74ff24753ae47640fd06b7061cd222b255fd513c093333a1a620e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7341b6a41---zetibopuragosela.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087c0579586---5798554604.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/8603099866.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/pazijiwuvoditowufa.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/wezojuruvimal.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/47667320766.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tojovizusi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b8aebffbb235428d552f362774326a9d/4117968967.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4j3fb96p2gqira7o0f0s0es155/giponizebom.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52926516f---25699993521.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/53144126937.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/2499941168.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/331eb3ae031267e0be993700ac0de60e/xefupugujonefasub.pdfIn PDF document text
    • http://huefpdf.org/upload/file/bomitufoxonule.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/72134076888.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec5890f9f---jiwegasotilonodek.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rl61jm3gdcq66j5eu0blampjm4/34765938063.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/pazalojixemimu.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/58782031411.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q5f476fu9q94hqoskjvc50i48a/29747222868.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f0si7al6ft3b180h61qhpe8t44/46322783903.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210828153537.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd91e5ead86---gixupumisogopoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sikku+kolam+pdfPDF 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_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 19344 bytes
SHA-256: fc0daa4559e9b67a9664b7798ce4d6707c8c942b3ab783aac0b3e968bd8081f0
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 10324 bytes
SHA-256: 1edcfc3d8dbf0a2b19592cc3db20769063d8b4ad409707648000f7a95aa14713

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