Malicious PDF — malware analysis report

Static analysis result for SHA-256 c681bdb856b8e8a5…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 00:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 264b40c175bb9ceba8d1739b0ac9fd5a SHA-1: e9aed3b9ef2a46b02ea5f827a3d38d960003035f SHA-256: c681bdb856b8e8a52a142567c065d0abd60ea81807d7f274f786474a5d662b05
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=binomial+theorem+for+rational+index PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071444d0a4e7---rifurigew.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/ganumezazopelazadeze.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210625174724.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7467b17789637a8f34e14444b73762c0/selufavajevepejopereto.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/27581753001.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/66664255583.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/fiwisinoxutonasegolujar.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3a6453c9e0c2902ae0a504de0a733fc3/bikoletemotuxepexepalijox.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e6c98fd2---70769385884.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/37052776530.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762606ed9cd---zatatilepuzevinexilu.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/doxogigofurux.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf0b864f9---zugopijudimi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b2a8e19cca1f421056157734b267a26c/fogaxibofomuw.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xobizekapepud.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2cd7371a---nigur.pdfPDF link annotation
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e338e94b8167eb503cba860cd184863d/93001038873.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a960c4fd---piguxonadasepat.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/728973b944053f97e24561dd61677485/25369619168.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9bde63d0d8d99a49a69cac4733ea6cf3/62286627768.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppqmub5n5cldraopfargq920l1/wutejiz.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/witasusixejudojaji.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e933121ca---35022207995.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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 18488 bytes
SHA-256: f9c8ac6016771a2e57ad46f3747dd67af70df370137c253754da0859b7d565aa
font_02_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 10608 bytes
SHA-256: 339dbffe964b19d50acdb602b60c4350ced064b808de9a93ca9595eb71818801

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