Malicious PDF — malware analysis report

Static analysis result for SHA-256 c511d889734749b3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 07:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 753509944b02d01c51617a5ad73b4262 SHA-1: 24339d1dea1a7267ba5d16d5845466399a574c91 SHA-256: c511d889734749b35acd6fd6c55f95ea2444527fce54ec753a16414c2e952809
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=left+hand+keeps+shaking PDF link annotation
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2431fc907a6ab49feb674cd0bcbc620/94559178850.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/10245304329.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/85600368683.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/fifufutawura.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5940f40db---4084705112.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fngtkc47ahbig2tnm8gk2grl9s/xavodasufubemimafa.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jijatekapimokadizorizanu.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/86962723075.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/zuwutavo.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/18220314114.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tp17nbnjtsb8s5q7tn5khn6570/kivukadibilunaw.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/82194177556.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/45101010333.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/nunoxikujatafumane.pdfIn PDF document text
    • https://drsaman.com/files/xinogidibinenap.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/cvep06nrnfi1pgee8oaii81bq4/fevom.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06a224d641bb64dd487ef783532169ae/xofobudigekezi.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/wulolezubapex.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/8981824839.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pidilomemejuw.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/23359998789.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/081d73acdf25a903c544e06138e42c14/31745630917.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/34024925336.pdfIn PDF document text
    • 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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 10560 bytes
SHA-256: db376d6b44338f69d248b39af67207a7e093a59a12fe59a951d21b985ea958a7
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 17436 bytes
SHA-256: b26ad209a0a9ec36b12d7097eefa1a4199d07aef3bbb8c599b0432f32f13ecd9

Open this report in the interactive analyzer, or submit your own file for analysis.