Malicious PDF — malware analysis report

Static analysis result for SHA-256 2668a6cf3c8c9982…

MALICIOUS

PDF

89.3 KB Created: 2021-09-10 00:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f98b10178813a75877a67579a008c96d SHA-1: c0ae43f671af9e26b9ecc48195dad1abd7659fe5 SHA-256: 2668a6cf3c8c9982205eb604fd64c237e31b7dea4f6627881bec3b1a08253d95
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to external resources, potentially for phishing or further malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://journalofcritique.com/ckdosyalari/upload/files/86425152028.pdf In PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/pubufij.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/weginijelerokukatarajogu.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/gugafozunomuterepisesoz.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lamutinifikede.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/mafimufokuzotorin.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vunuvapetesuguwudorigeki.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/bezinosefotatosoxotogu.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/tobilunutunigidapifav.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/af57719534a4a2a7102ffefadabb5c97/13002476657.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87808350123.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613743742cd8e---92693200749.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/57a100aa8940d8e43d0253f0b931aab2/tigepek.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wakotusobebepamefosawisi.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/76725129838.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/98373155031.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vixowasigega.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/35887335490.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/26525049450.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/85260090426.pdfIn PDF document text
    • http://skupka54.ru/upload/m/duwetoxideponur.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81717f8ee---47364009432.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vivodumogakezina.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ecab1eafbe97bdd6905146b78af6083d/27941424944.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135c08a0b8e9---87787309793.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/3176979533.pdfIn PDF document text
    • http://centrons.com/uploaded/file/68500661861375fbfd36e5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tintin+and+the+red+sea+sharks+pdfPDF 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_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10484 bytes
SHA-256: 96ad43ce031a2e045ab91e263a342c084d27fabcc479c1afe7c728fc35b64dd0
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 18120 bytes
SHA-256: aa40c9c6ef4861fbc01b946ca76d23aece11615102825001453714ded3d188e7

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