Malicious PDF — malware analysis report

Static analysis result for SHA-256 12523d6c36d1c83f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b93566c4e705f80439acee2c8f93531b SHA-1: fd1f7344aee407df40ff676322f629d1977244c8 SHA-256: 12523d6c36d1c83fae067b6e89928cde7501958c98bda0d4d81c5dd78f457905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to disguise malicious links as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=real+estate+company+introduction+letter+to+new+clients
    • http://chinamakina.com/userfiles/file/54432953866.pdf
    • http://stroyvodservice.ru/upload/File/69463935470.pdf
    • https://dennismaloney.ca/upload/editor/file/wulezuge.pdf
    • https://arslanemlak.com/E/file/
    • https://gryf-wet.pl/ckfinder/userfiles/files/fowazupixenu.pdf
    • https://dogodanang.vn/uploads/image/files/63551424123.pdf
    • http://anael.fr/fckeditor/userfiles/file/mesuwifimubemumatisuboxew.pdf
    • http://personnelstrategies.net/userfiles/file/97823156155.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/ramepav.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/zosorezikaxebez.pdf
    • http://tjsyjdq.com/v15/Upload/file/2021917254166285.pdf
    • https://ivanda-commerce.hr/userfiles/file/wexevuxowupe.pdf
    • http://russia-ex.com/images/blog/file/9150237531.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/vesaliwurafapuvawo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3d6bf84b---wuvefuro.pdf
    • http://designerhouse.ru/upload/files/22864196445.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c91b82c06---dudixepeneburofix.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb7860dbd---60714897857.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/vesijamulitupigufodamaxip.pdf
    • http://odontotecnicacoop.it/userfiles/file/86130498443.pdf
    • http://drtamerturan.com/file/35713951348.pdf
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/ketonojinakajenusevopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1e.bin
043a500636c122fcdba633e198f42fb886feae7f27de373d6c9c1bd398f0e1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 11020 bytes
font_01_sfnt_off0000f3ca.bin
2bf8d825322e386758caf5d73844c6aeaf839e75e1a286fca4062a9c69db696f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 17144 bytes
font_02_sfnt_off0001200f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes

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