Malicious PDF — malware analysis report

Static analysis result for SHA-256 813a3113cc467d71…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 06:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3cacf9f09aeb6e94469f945befef732c SHA-1: fed60f274f96402c5646611ce8695a08453d7c3d SHA-256: 813a3113cc467d710e43c783db847a4a88fb81b383285002a9cea91a1794b9a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=the+car+game+solution PDF link annotation
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/20230518804.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/70536089539.pdfIn PDF document text
    • https://epiphanych.com/images/file/56254857232.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6066311167a77b70553814a658918bd1/18335132825.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/32395737344.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/aa6f8f0b72b62b9592c321c1b140f321/98502724869.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a179756b---75163412652.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4f120dacfa54d34373605347f520fce0/weredukudukefofi.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/sunugixazadusonajitexef.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161005e70ec1df---rupawog.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3rpi6ket7m60647lnbksnn1jgm/20507023019.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kamanofo.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/69625678056.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/faroninot.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o7lj9q68nok08dhrjtiqnvats9/xonipanubonadaget.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/17755343788.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xuvusojajiwudejowa.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/55735846107.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10694ab23---jozekexukaxofule.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/30380367295.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/zikidivuxuletakimon.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazeluweg.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/fepajeri.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 18164 bytes
SHA-256: 320334612b001198bccd7a72558023bd212a179c9761ca11d0fb771ccb89fe89
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 10740 bytes
SHA-256: 98e35d701103c4f9285d2f80e372fc49f45cddc9c68b2fd7bdfd2414bfb95682

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