Malicious PDF — malware analysis report

Static analysis result for SHA-256 84db78ab22e38a04…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 01:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98854a9a8fad4afa1cbe72a85d309943 SHA-1: cf25c7232adf99b413932977a035d1b708b88a16 SHA-256: 84db78ab22e38a04323f3d9b2dd8dc3d887f30fbae4064b1588928a640f398fc
156 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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=estrategias+didacticas+para+ni%C3%B1os+pdf PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a802d3687d---35425029613.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/39700865eb19b0f6c6a62e3c36c8a8aa/1256907661.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/rakuk.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d6ce7f46---87120629892.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/77878842368.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/355286051.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/3817549133.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/74261385751.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/ratovuxisonu.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/81644566059.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/206becae2fbf06f8b9708e3fca107d0d/kitimijetufupe.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/padifalaxerepexufosus.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/88398419099.pdfIn PDF document text
    • http://cocoal.com/uploads/file/wujelodenubabiwerapufu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbef73252b8---xujimanofunanukogun.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/75945810920.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/pixupadeni.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/xezexufixuwexunesu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021630238472182.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb7311f9d---fonokajuk.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/1220523613.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee68216fb---lirepikisawuvoris.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/mubapor.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/45578879455.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/nelatolameputak.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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 10936 bytes
SHA-256: f2b8aca7f930ad3abdfb14b6aff864d7781d7fe82ad0de22b2d702bda671afd2
font_02_sfnt_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 18368 bytes
SHA-256: 133b48f25962d87251a2945010b53969f763d0f1f99d77172c1634d4f1b02c11

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