Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2509c74712d452a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 21:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22b832f06095b3f6545783751d224923 SHA-1: 9abd6157e2ba0d2d8bd879397f893fccabd80995 SHA-256: b2509c74712d452ac448aba146b6c6e53af7d36d93e9f3780d13c9dcdf3b9072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful external resources.

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 https://bloomeng.com/uploads/kolijezodure.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/98528034850.pdfIn PDF document text
    • http://unitjaya.com/contents//files/gotaxaxo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/45982294474.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8cb8df16---vemidasuxowadavura.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891635daac3---56361986628.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/daboxe.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/4576927360.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/203c6bdeea169f1aad76159ac801d800/90468490363.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cae8c8a1b6a---favejoxuzudivepi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb8d06792---57138229775.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7041cce4bd---40708652775.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gekimowupotidafib.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/xipuderoxomafitedege.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/d6qfhjthe7pn2uq0fhff482r27/5407762346.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/semovadori.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/84176350759.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/rafirenetepozugep.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/kamuduborazanudamasak.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501145832501531.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/60992436211.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/fokugutimuxudi.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gokinofu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e1fe072b---93968501173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=counting+in+french+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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16784 bytes
SHA-256: c78af82318e807f78e8cf3cce3b4f81abfbffb6f6293765de05cd29d2f5144dc
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10716 bytes
SHA-256: cb418852d9f4a07fed0a38c97c882963d09599c40e816d7c3e05b9f20ab235c8
font_02_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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