Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f15460b464352d9…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 00:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d76dac385fc2b2131e6ae6159d4db16d SHA-1: 3a314e5b4704a85d1944b955366dfd4764c4fc54 SHA-256: 5f15460b464352d9e78528209a8e7a4559628063882dd7197e1d5dd0055af876
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised or disposable infrastructure. The document body is unreadable, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://architettodrabeni.it/userfiles/files/2580372304.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ba600f63b---vezudenawetazovak.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/refeji.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210815143701_c8yor4.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kosamunisanosetegozi.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/88010313736.pdfIn PDF document text
    • https://okazionche.com/files/74506898167.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/malafisoxetutu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/nenitijanadupevaxaxegeko.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d8cc75eb---jidob.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/18304922327.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/wurozusidasevasufowevomo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7575cd8c8---19660362553.pdfIn PDF document text
    • https://orrizon.ru/images/file/58000675002.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e03b9de4f---62643499830.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/pupunam.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kimotulusad.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qkrtk2jse266pc95go77c9c5q2/99146187144.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/61521941409.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e7e3bae3---fapogomikabamadimejan.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/73011029323.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vesok.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/62236821738.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b269b469842---8502831064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=find+endpoint+given+midpoint+worksheetPDF 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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 15828 bytes
SHA-256: 0ccc980626817a091f35e57fbc384cbd0a65f0b11e12c510848ef7238bbf0baa
font_01_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 10852 bytes
SHA-256: 5ca4f76c75ff98ab26646e227f02d5b54e5ed497e88ec033fab96d5fb936373f
font_02_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1