Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6ba9907685a08a…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 16:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bf6ff1a5105c3f5ef7dc07530554757 SHA-1: eb7f09fc2de5b2db1836b10882bb3f4f4a379b6a SHA-256: 2b6ba9907685a08a1ffe532c479e9498345776cf0c0f8db4702e5bd6f0638464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The presence of 'utm_term' parameters in some URLs indicates a tracking mechanism for user engagement with the lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crewmak.ru/uplcv?utm_term=coraline+book+free+download PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa774d72dd---wafesotifadaweverewib.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/87a45c330ed299270da00b19bfc3155a/23234108512.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vawogesiden.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/finipumixebagibojigul.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/fudiza.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a119b7a0416e2ca1834b125f0f803af4/babanu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kegikutilorudewabozarenuv.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rv4lp4bb3th4jc4kfm82u7r515/35978430764.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/gufoniwezivukeruvu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3d6a5b77c25b9308e1d61919f6bd53a9/rotas.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/pexubijetutedefomiwa.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/38566260527.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/jirizulitegev.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/9226578170.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109102017598291.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad823922b---62467313624.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff943c1ff9---mafita.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/35225696268.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/43518617699.pdfIn PDF document text
    • http://dr-temt.ru/images/file/dajudikewu.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/46677506744.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/pigijokibewodogexid.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614455c1e2869---19680708125.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/katepurinose.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_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 18176 bytes
SHA-256: b6d791861f868fe7924a6a9a793c34828677bd1fceaac777eba01dc6f66b26f8
font_01_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 10428 bytes
SHA-256: 108bbe0823eec7ad4d7390644e7bde2c7a75f109f3fe431df8829ac694e6129b
font_02_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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