Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c1e0d39dd639c3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 23:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff307ed0872242a5d25fb3d99fec9f70 SHA-1: 2e9a1c53c920f01dbb54262285b84f1ab174322a SHA-256: 86c1e0d39dd639c330a1db044da1ce3b77cf6a3fe5cc659ca9b4f62fb03b440b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://355353.ru/userfiles/file/93491378383.pdf In PDF document text
    • http://elskup.pl/images/assets/file/19213843581.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f162dacd9323d988e8131b818dab9c01/56447870703.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/lavupavafarepibuliv.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/24061644994.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/72721855770.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/87467184214.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/64744300782.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/71297152096.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cbb07256f54414a3049a0913e6ef6d47/gasatuwejasumuzizasovori.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee733add---42131603183.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/99129183420.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/52860990794.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/fajadafukewagimukola.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/74325223312.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/gowemabovurenigudateja.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/78921658920.pdfIn PDF document text
    • http://rjt1.org/upload/files/63082569511.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/59847067751.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/92579714346.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/xijapasafisupesamisironur.pdfIn PDF document text
    • http://nessium.net/userfiles/file/23478260135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dynasty+blade+2+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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10540 bytes
SHA-256: 694e197443bec71c591e5108e66451df79fd4cdcb28d0605bfa1438151d4876b
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 21176 bytes
SHA-256: 9546e8011f1390a265b6d46fb2ffbe068d69ffee2a8e33bb2a0248861b56d6f4