Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bf38711b199a2a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 01:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c30913f082178dd4dc077504147597d SHA-1: 65b90e517a18ac74bbf78159949ab156d2c60a2f SHA-256: 93bf38711b199a2a7193a39526118e02591c2d99b998e7c6faef2c0a3a94c62c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to other malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://iwistw.com/upload/files/xorajulajowomexaxefa.pdf In PDF document text
    • https://kuraniterbiye.com/resimler/files/fufizof.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210919_8FE3A5B9E007E439.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lp6dev50dkk1hk5u053hehlohs/sunelipakuwip.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/12371892989.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/35865072165.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kurufatixulo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a5e98506b6196d2f1c24131a1f278feb/23360905812.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/linowoleronavop.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/97590450272.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/81559083462.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/xidagopubebuv.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/5061658059.pdfIn PDF document text
    • https://reha.bg/content/upload/file/18100956496.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/96323986237.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9844de4a---90065575939.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5mnp074ernq6ir4ne05bnnf7i4/xosazevire.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/2831309892.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/savepajusiguv.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/javadalofotasuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pes+2019+offline+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 17272 bytes
SHA-256: c543dac07f692499d4c32e790c1d3263c7c4d72060091717efad89fe73a75b58
font_02_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 10708 bytes
SHA-256: f3348a44d3e506b771c1d7530e98728f47d7b0f4dac55ff2ba1a2cfd7ff9479c