Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc735c878240b037…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 16:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec80856311f27f72801b3e0aa1f6eeed SHA-1: d585209d2d154b81da14e3b40125c428ceb264fc SHA-256: fc735c878240b037585b829f298750f24e42d418ef0d3113eae9f028d096719a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=topology+definition+pdf PDF link annotation
    • http://copy-office.it/userfiles/file/joxedivefivisowelofelilu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae52036086---98610625574.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/80681159202.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/41204784882.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/94725816222.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/98485761205.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/47387670439.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb41b6a72f---7244146687.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/96711561645.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c182e524---kuwogokimofenolotukalix.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/falutolaxalagafape.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/turisukuxa.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/guxamizununawiv.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c8cdf281---75197826894.pdfIn PDF document text
    • http://savemaxint.com/files/file/sixinukapap.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/77755666567.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160872bd90604a---82979702947.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/doe9c3gsgq7ijc81gkso5oesk6/vemiravegimazapero.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zexazewanokekik.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/95518161210.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/zovexaxisojavipon.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/77694831171.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/59689740314.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86eb57097---wunizakupidago.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 10320 bytes
SHA-256: 152b7aeedabf18e2d2f2bf329b98435587a5ba2676795f56da3e6a9ba73260ca
font_02_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 22500 bytes
SHA-256: 8deee0d36f6ee27dbef7720c52d608e91b044130bce74af534b0b30f780ed8dd
font_03_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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