Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eb6638cf867fe4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 15:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f20254dd133a7cfc5b0e0027bb1ca1bd SHA-1: 714b49eedcbb8a236cdb8c6aaa8cc3249cfb04ef SHA-256: 49eb6638cf867fe45f084d4dc7457853e831fcd784c4b5ec03b48e9040712fb5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites or disposable domains. This pattern is often used for SEO poisoning or to distribute phishing lures, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7945b634---wigavugijexekebevesej.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611650f95efa8---76474903085.pdf
    • http://www.cbs-emballages.com/upload/file/35845347606.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8e66ed5643343a41ff782d3ff64ce6e1/98190745408.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/49066076624.pdf
    • http://playbabydoll.com/userfiles/file/55195279208.pdf
    • http://zimaletto.com/uploads/file/98962852808.pdf
    • https://fl-forever.com/upfiles/editor/files/15851660209.pdf
    • https://stdtekstil.com/upload/ckfinder/files/63779239838.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mj46oifncj3ng628b8ne3m1nk8/sikixenunarufusan.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5683251bb5---44472844496.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d785a2ee7114b61974f9e1ccb0caee65/46555273522.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/u9jd6krffdeds2rdfdvgc1jie6/gasuxow.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/66940613336.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086557047452---gaburofekagaj.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eab1edcdc---kunudatasuxetofalewulefu.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f1f56a75ea156d73638939b5f3d85598/vivekav.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607264db73771---21823530914.pdf
    • http://hzbmsj.net/images/upload/File/dalerijaser.pdf
    • http://kesifveotesi.com/files/jowipigogaxebirefir.pdf
    • https://goodline.by/userfiles/file/52754536970.pdf
    • http://amajyuku.com/files/files/35680048321.pdf
    • http://kcde.kr/userfiles/file/wuvodivigifozi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=unlimited+power+tony+robbins+pdf+download
    • 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_off0000caa1.bin
86c1c5b8a385b6c3c616a8c4c61400cbdb6e63b67bf7f263d883e0f1989d4a6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 17964 bytes
font_01_sfnt_off0000f8fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 16792 bytes
font_02_sfnt_off00011115.bin
007763d674c8e227b6a997fea1bf3dbcc440757b08a6f4af23d4cad30d1c4f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 11004 bytes