Malicious PDF — malware analysis report

Static analysis result for SHA-256 abef144dc5cce749…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 19:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77a24cc662de623449d76d4dc7e46742 SHA-1: af8df449dfdd4822e4504ad2409d3d4bbdc5f58f SHA-256: abef144dc5cce7499a0d782dfc51272116cecee89935070d087e0603d6231cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rainbowprinter.com/app/webroot/files/file/17295332174.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134db2a556b2---16100184352.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/26846495992.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/satapasu.pdfIn PDF document text
    • http://metall-press.ru/files/fudegunagumoz.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sawutefovip.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/lezexeralu.pdfIn PDF document text
    • http://state-lithium.com/upload/files/zofirixorefidebago.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/94937203956.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/66932699191.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/wefexodidedazim.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/bododipifoverezuvogon.pdfIn PDF document text
    • http://brlairport.com/images/file/11900866825.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/44809356319.pdfIn PDF document text
    • http://strahyi.ru/images/file/jokitugotoji.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/81513178875.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09d631d17---noromezatomaserifexikud.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/2728565839.pdfIn PDF document text
    • http://generoussecurity.com/uploads/8490671649.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d12d1e5b73fee9ca433b9dccd1b1a636/41378702398.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/nedezukenofefivijunuse.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100001246658.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/remugare.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/9993345283.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/jovabopexewokaximukitix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=quik+video+editor+mod+apk+downloadPDF link annotation
    • 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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10788 bytes
SHA-256: a5dca17c7a465af6eb3a02feec01b96b75cd08bf2f4a0e95c5e22912b39040ec
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 17576 bytes
SHA-256: 70254f54f00ead9740cf28216975cb0b6959af0511c0bbd9e13de825c86defaf

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