Malicious PDF — malware analysis report

Static analysis result for SHA-256 137c12a0010b1912…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 15:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70610ac127cb9bebea03197575d4c461 SHA-1: d71a34432a0193fa960b81425368cef1b88d1c8d SHA-256: 137c12a0010b191255bdee74ec4bdcde48c701549d58e8e59ffd20eedb4f02de
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7cd69adbd317dc4d42c20156790a8552/99788513015.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4707b14a---94964021318.pdf
    • http://backkwang.com/userData/board/file/vejozirevajamilitane.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/sisilenapizutinapojamitib.pdf
    • https://marblobathware.com/app/webroot/img/files/65137697266.pdf
    • http://novussiteyonetimi.com/uploads/file/85752276451.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/55ee7a1411031b6aa2c4cd064a13b834/javakasipivexi.pdf
    • https://cengilli.com/icerik_images/file/17918056855.pdf
    • http://visit-pune.com/userfiles/file/sixewuvufuvurafa.pdf
    • http://abpaluso.com/upload/file/kajotefoxalodofewi.pdf
    • http://podiummoda.ru/userfiles/file/tosumokejowepuz.pdf
    • http://dancephoto.ru/userfiles/files/saxoxamozilewejajewal.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/llhbpu1rdrph9ceei6o6kabnfb/891869207.pdf
    • http://europawindow.com/app/webroot/img/main_content/files/90190652533.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb76ee6a5---dedipunugi.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33346af1d---24874669750.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cheapest+moving+container+company
    • 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_off0000fc0f.bin
47ad83dbb4b309bfa469150805ed796894993a91b8fa43b0c45da41a18a9a066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 10988 bytes
font_01_sfnt_off00011582.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
font_02_sfnt_off00012d94.bin
6206cb3d4068adbb4e4896581a4aa01797d699f7a682873949e4d0935f1d96bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 17332 bytes

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