Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0fe5b5f5fbd1be…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 13:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cadea5c604e0938c2c5368c56bd46568 SHA-1: 841e27a7e9ae4bf66773fbc073a7b49b16958b2e SHA-256: cf0fe5b5f5fbd1be4d7e152ec24c0e06fa7c7aea7e85feff6d7f7d2de135cecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress sites and other disposable hosting domains. The primary heuristic indicates external URI redirection, suggesting the document's purpose is to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=seks+igri+dlya+android PDF link annotation
    • http://sun-green.nl/ckfinder/userfiles/files/3701709375.pdfIn PDF document text
    • http://candientuvibra.com/images/file/6471789680.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135aee97d7d6---tododevifi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08178c383---69520240580.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kotegirulegoloja.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wizewetagazasadil.pdfIn PDF document text
    • http://huntland.hu/upload/file/badurusivesevi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/33735434150.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/74939529669.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/28031959332.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/sefozusijote.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/12488317536.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/83540406853.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lobogusitomirogusota.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b090730c0---74156295473.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/93335450052.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/50407867212.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/lomuzuwugolidu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/62000395309.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/muvoxemefomupaxu.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/gumokuru.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00f06af4f---nodizajoles.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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 18060 bytes
SHA-256: b18f95741b899664d3db2b710a0999fac44273d5fde6c0b57f4f7766b2aaff01
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10604 bytes
SHA-256: 7bb109804aa2488c5435f318d072f9158906c043beeba2f5be979f333c5ba890