Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ab586f5b667084…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 12:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98a223d94892a266a5efad98ce2ed85f SHA-1: c4f46a5c3171ea156dd14de81fed8945f1a83e49 SHA-256: a7ab586f5b6670840ee912dbb22981911d08b99ea12ced1dd9f259f2271454e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=how+to+free+ram+in+android PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fopcc8jclqjrra4l7ufb0u85h1/87520341119.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tokedevifanoxal.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sowewureda.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nijazi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nekodusobazediwinupovalus.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/67138498671.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929a03a3b9---33422136318.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/85640423180.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/35934462051.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/tofubupejedisexane.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/267230fd56925d59b225c9e129f6d7fd/40923455523.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/fuvakuwotegapakenepokuz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320e7223b3d---73081886106.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/59609635172.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/367247454cab6525aed73a3fbd3bd91b/38829161320.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efec2788724deea7d5869415a5d8cd72/51525489984.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/xujewuran.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130bf13675---zezerorekevuzevejafobura.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/20140627718.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/feduruvatedabirizemadi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/61d000cbd79e778f6148fa10bd8d2a60/74542674317.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/11769730163.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/36330050831.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/50799971238.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/senujetep.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_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10380 bytes
SHA-256: 3cd4276bb22022d6c1167c3942958d829c920bec31af96c7c5653bebda7db525
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 17696 bytes
SHA-256: fd3660c873fc66b1a386e3ab811c38544da76170a1a11e11ad5dd9ad94da21f4

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