Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc93244a4ae2f3d…

MALICIOUS

PDF

72.3 KB Created: 2021-07-06 08:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c27d0605743be110a90507764c0ae9e9 SHA-1: 21eba164d868d7f17e8a98fbf19e906486704e6e SHA-256: 3fc93244a4ae2f3d31363cf761c659e43a5edc82e23ddcf077a44a0230833830
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a238ac86d05---rananegemuje.pdf
    • http://bioident.pl/photos_fck/file/85008126318.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b858c91c0b7b6c825b7019e8809b1b31/bamazizerasiweweted.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8c81fae4---wepubuwokugepidi.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe271a4bee---xurowegepozajokanovag.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b038c6d41ce---zuluwof.pdf
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/jusamabawoj.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aceba3e090---35390397501.pdf
    • https://webmenuplus.com/images/file/rojawelaxefirakexoxi.pdf
    • http://pogotowienaukowe.com/Upload/file/siwakolevafoge.pdf
    • https://eltonltd.ru/sites/default/files/uploads/mujuzujiro.pdf
    • http://madmojo.com/fckupload/file/sisotexabugafos.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/bae1d993b1a1647273338e09f08a6d3e/xuwogir.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/87af04edf911b320f04c8ac91b6683a2/sobanidipivotazitoz.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/wuzolugin.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3432437e4---73432428247.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ec59927594e290eec6dcae98b3014679/xutuzenin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ehmke+well+drilling
    • 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_off0000b7a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A6 16792 bytes
font_01_sfnt_off0000cfbd.bin
5a470a22c7609c38a3ef78630785322483cb00eff1d062c3287b1aa51fe2f54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 10308 bytes
font_02_sfnt_off0000e66a.bin
04844162cb090d6a14fa7b91b05ed272786d114b1723b40abdff1b7c784ae15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 17120 bytes

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