Malicious PDF — malware analysis report

Static analysis result for SHA-256 c190fd4c6515e5f7…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 13:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26c624eafa33a3c37968c61032f2b029 SHA-1: b27ba7ba6103bc8115814e534592ab16ae2437ae SHA-256: c190fd4c6515e5f7b2d7d7a20b0135c96c8aa61bc0798e151f5de62b1d6449b9
164 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 phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=pharmacology+and+therapeutics+for+dentistry+pdf PDF link annotation
    • http://karmand24.ir/basefile/ehotel724ir/files/63971215147.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/05d5fd7c4b674f7ec1e43d549e2bc9f8/tibefobatibemij.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/69d5poscebm6is51j1bavtstsk/pefetadirezifeketawenesek.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/2497452032.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f837e6b66d---48382062939.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/faxidemekok.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baf84406cb4---welogugejar.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/limowozonewibilo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098541f54d5a---dimexiwaxetafi.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/susegolanalelosevoxi.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/33178667712.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/13548652640.pdfIn PDF document text
    • http://pmke.cz/pictures/files/pedewevumugelu.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/seragasogibob.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b9a596bf---89036728111.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/vadokikepilez.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160988cac7c2b5---gilafakuzuvigabepekirav.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/foxifopadatimaf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7913e9be84---3724482798.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f957af112---fazaridajisusokuveferaw.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb87d90533---mozitojovusavonetatusiw.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 11280 bytes
SHA-256: 736867cb34fdc77922e54367b27e9951f0fe2bc0a4d67e6ac3c3d0bbf1f53871
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 18144 bytes
SHA-256: cde0c73f9bb7282f415dc8ad57e64bc22b6d817cd0155bb9bfac3e3f5f25e8ec
font_02_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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