Malicious PDF — malware analysis report

Static analysis result for SHA-256 90981ee2c21bc063…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 04:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c430f33d14fd82b2da35fc949e53cec SHA-1: 0e1c79e95ba24a99f11eab079ebfdad609dc8577 SHA-256: 90981ee2c21bc063f6a7a636e7dae7c0f94356c159896417a0321e06df39ea27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=pdf+to+image+windows+command+line PDF link annotation
    • http://nguyenthaotech.com/upload/files/sowububa.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26013d6d4---55849326656.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ivkfhrdoos7iq7r5c8d0n9v5q0/taziduzatutekikuwija.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081b69367c9c---norezapuxagatiwewubinifu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/20544736550.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9c73ad51b3d41b2405c46a876c23f24c/jagujewefenofijazuj.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfb5ef124---wopaga.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5754398c23---wapiba.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fuwolumekofonokotakikiv.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/18668737182.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wawuxapedubos.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/732cb5e2de8eb7da85e79b3174d1032b/14878610995.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/80382902120.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9391d943abe3bf612a2ae91638f465fc/14267003502.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/20473249804.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee416d00ca---lubigufoval.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607928c6749d5---pofujoxedezukukajoleto.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/07/file/20210607_161248_167.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/bedorapubez.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/rabegojixururajukoze.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/45712257184.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/ronujarukorakovofosobuge.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/6123707612.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/52876308598.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10804 bytes
SHA-256: 31f833eddfa8d930004249ff97f474c7efb9add1a308c4f7a416c58aaab8920a
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 18496 bytes
SHA-256: b377f4b4ab40f4571475b1e1cbd3a9f0f2bf496ab69c826fe186a1eef4d2673c

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