Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f197d85e0ad6ce…

MALICIOUS

PDF

89.3 KB Created: 2021-07-08 09:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d2f7db134bcc0774229d123b756e7b2 SHA-1: a66aef828e12964321c657ce2bc9d90646a77b90 SHA-256: f8f197d85e0ad6ce8c7814e0d148c30fdad292a92c02536b9239fa1049455521
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other domains. The presence of numerous external URIs suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://officinedesign.it/userfiles/files/werusa.pdf
    • http://deeringbayrealestate.com/userfiles/files/lakisepibitezopajisu.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/xoxolawofubabiriw.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/be0733e1bbd42e7308bf965803b1376b/87716832514.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3vhrkmhm9sv26h6ghq46b30hhv/67436063759.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/80e161a80428f40aa7d2da4aa9cd7cee/kedivovesuvo.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/uor8p8sti88jlmcbqjdmabud0d/66607819397.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b38ecfe4a---18692058401.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/rugdo50krvvfjb4812k4rfgeq2/fovozar.pdf
    • https://diedacorporation.net/freesiafiles/file/58898890029.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b63591b8c---56206051764.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/68f7b93974323f3f0a0730d59b1d3af6/pewotevaduwakemax.pdf
    • http://zhengfutz.com/v15/Upload/file/2021519217265580.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987d82d7a4e---73535139298.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h8rprsmt590q7hq6136u0lbiuh/28579482795.pdf
    • http://judge1960reunion.com/clients/873273/File/2755452702.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b7ca9840---tadepiwafonekojidasurew.pdf
    • https://sport-jicin.cz/dokumenty/bimasajabebafafipisala.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/jevaf.pdf
    • http://ecohost.ru/pics/images/file/44736890147.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1351bc7a52---34060572064.pdf
    • https://uppersanduskyrotary.com/cms/files/File/jivekogafugogikaso.pdf
    • http://kulturazebrak.cz/userfiles/wewukidobezo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ministry+of+road+transport+and+highways+pdf
    • 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_off0000f5ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
font_01_sfnt_off00010e00.bin
1f90a4bb8e51806f02bf1003c8d106192f105ab6bfe60d41f14fd8ee35d0d013
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 17704 bytes
font_02_sfnt_off00013ca9.bin
3de6d7b23b0f056111e702d16e8b624f16606fcaaf739b79cf77f938f4d201c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA9 10792 bytes