Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e12c74b41050f7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 16:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 788cfdafaa8b4698f1f77d6bd59fe876 SHA-1: 0c2e4363fa53803d64ffd537df8978d7e7ca1c0f SHA-256: 35e12c74b41050f7cf45b073d5911356c438916bcbdcaf3cd6d214ff1f6c467a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute or redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://sntaviator.ru/ckfinder/userfiles/files/fidusafagobanotufatur.pdf
    • http://ogledalata.bg/uploads/pages/files/13985075287.pdf
    • http://headlinesdinerla.com/uploads/files/duwadajilojul.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/87e5ba22f360b334c9fc442abcf8f013/pemojojobowa.pdf
    • https://cambodiadriverservice.com/userfiles/file/95693435151.pdf
    • http://www.ufolep-69.com/contenus/files/53885612019.pdf
    • https://sanvexe.vn/webroot/img/files/59638966600.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f7dd4d14859e67290795c706c6a1b40f/75336207146.pdf
    • http://www.fonfe.com/uploads/files/987092883.pdf
    • http://reflita.lt/uploads/files/ranofizelapawamumakonez.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6jpd218greq8rt9tnev8453bkk/wabite.pdf
    • http://cellesekorea.com/ckupload/files/vikekonururew.pdf
    • https://dermatologie-francophone.com/userfiles/file/roxiva.pdf
    • http://salsainkonstanz.de/media/files/kediguguludejudidevaje.pdf
    • http://pekingtogo.com/uploads/files/54434364690.pdf
    • https://tbsva.org/Upload/files/20210901000010.pdf
    • http://patrickstaxi.fr/userfiles/file/xeget.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/domogo.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/97915164599.pdf
    • https://foulardfotografando.it/file/gilakovovojala.pdf
    • http://irodaszer.lukinserv.hu/file/dunafot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yify+free+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_off0000df66.bin
5ca083ebe28a090146bd8487d57501c472147d2ac9607d900e3453ad33ab27cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 10264 bytes
font_01_sfnt_off0000f694.bin
5791caf32c61b765c7889ee5344c27b1b7e5d4e0fa932893d784c37a732e207d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 18432 bytes
font_02_sfnt_off00012661.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 16792 bytes

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