Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c487443f9691a6a…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 05:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46084d0cc4ead417c0e6d6cf5542dbc0 SHA-1: a36f937c37fa29bbf8f5af034975510e5df27699 SHA-256: 3c487443f9691a6ae9c269494b5c47aaec62befae94511d1c0286229b38df9b4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The document functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. This suggests an attempt to direct users to malicious or phishing pages, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://brmxn.com/userfiles/file/20210802153400_weixul.pdf In PDF document text
    • http://architettoseneca.com/userfiles/files/jeduvovunufogafijad.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/72678996390.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/29014833381.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/zomufekimudulesepazupijak.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/48820056040.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/ruradivagarokepezogev.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/fixeve.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b11a11763---pevekogaf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d23ab8f6614a194b657dbf9d7a670e8a/33594711388.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/14d38319894b7a9942113f279e73e805/xixapisoze.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d826355133---filopurigazazevarap.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d193e1b3b---13002957232.pdfIn PDF document text
    • https://olterus.com/contents//files/1234184713.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/41073819260.pdfIn PDF document text
    • https://abeess.com/userfiles/file/govobobole.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/timapi.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/305jmokvo9igouuffuaqv58ek3/savewifomedubabonu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10ddc77a49---gabejekemeviz.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/waxoxunuvelulij.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b834454fef5---temenigipuxosadarinani.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48ca52e29e---869207182.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/jelemis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+there+a+way+to+see+archived+messages+on+messengerPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3096d26e8b0c96dfeed00dc0f298db53/pedoj.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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10988 bytes
SHA-256: 08d4e9d67481f86c90133f08aa6412653f2a8ab4f7df64d908d0faa474d601db
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 16924 bytes
SHA-256: 8268765aa0e0392e896783c674bf63416645eb1d9271d1da3ae16cda3f692a98
font_02_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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