Malicious PDF — malware analysis report

Static analysis result for SHA-256 a759563d4de7e623…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 21:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37788d18d8ebcf14e65275b87169e6a0 SHA-1: 961e7cc46c41334e7dbef30a3a5973396b6e2d03 SHA-256: a759563d4de7e6232cdae7d5f71aab3e0ba4316398153e41a2d5c8f2d2bc2a2c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=olympus+pen+e+pl8+manual PDF link annotation
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/ganawuz.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/tobuxopasoruxajebujoxaki.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/xutadi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4cb52be7---14019266658.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db738d18f38---refavizelixovinuwofe.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e28e97d38a23dd468aaf53d35f834415/33484325485.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd654fb32a6---7508185845.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/50602805462.pdfIn PDF document text
    • https://ivanamihic.com//files/16094770575.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1q9djcfqbt0u6t40nfu8ljod37/rikinopopaf.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/jidamukisa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e254972da---kelerixobesekel.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/rilipilemivojoju.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bbcf265df5a378e689b95a6727295e06/10673706927.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/denabipapuj.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d3811e6d---kopakafixa.pdfIn PDF document text
    • http://simonide.org/userfiles/file/92203563393.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jujatanin.pdfIn PDF document text
    • https://castel.ro/userfiles/file/92800951197.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1565b0fc3---vajevagipijejawovug.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/lenativi.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/tixejajexo.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/11715529974.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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 19768 bytes
SHA-256: 01c39ba114b1b876a7c046ec6eb4870bb1f20f07464c778e4e476c5050670ff6
font_01_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 10448 bytes
SHA-256: 51f795fe81f1e2590ffa5e5552a1ea4b9f38b1ee7596c3824ad85160cab65764
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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