Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db58f0307dbc3b2…

MALICIOUS

PDF

81.4 KB Created: 2021-07-01 19:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76d846f1d8e33238b61560c4d9569168 SHA-1: 2a543ddaf7b7628fd0d3515d4548a3c056b7bca7 SHA-256: 9db58f0307dbc3b232967a27ed3c9592d782f53d8da09cb85e096a7fd6f7013a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

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 https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/cd4e58953e009ff004d2853926906f39/4961812720.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/fcad966c37afced41543808f6369fc18/gegib.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d64149884---15357073276.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9813f2781b2fe1a32ef9585b9209ebe3/ponutowogezup.pdf
    • http://goref.ru/files/file/jutakuvesej.pdf
    • http://pinturasoltra.com/images/slider/files/30927163428.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/91798370854.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/54883808877.pdf
    • https://aawyx.com/sites/default/imageuser/file/14742189681.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c248116c---feputukupusufiliwuka.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6ccb045969fdd255133c1ed30e5a5aa1/89672296483.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/surevavimawum.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaae6e205f---vavaxibexaresixuwufetobu.pdf
    • http://burrburroughsfamily.com/clients/55468/File/18746006414.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0de080dec---50358612890.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49280793445.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1f40e052a954502f2c067308c9bfe779/zerudaxegofubaz.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe175cea72---64130285207.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/57303727278.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd7a0b862---tubatapamal.pdf
    • http://agrobud.net/uploaded/file/90402457379.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+game+mod+league+of+stickman
    • 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_off0000da3c.bin
e4aa7b5131efb9a109831298c729e970bb08ff7247bc3ca7f60f9a6f914a91f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10996 bytes
font_01_sfnt_off0000f3a5.bin
16cffb3e4b267d1065a4cddb30d92e554fc14cb2f53bd8af4fc5bfcc06f6819c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 17240 bytes
font_02_sfnt_off00012093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes