Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17b62fa93b28541…

MALICIOUS

PDF

92.0 KB Created: 2021-07-20 19:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9b21a1495198e9ab01bc0abf08449e2 SHA-1: 79993a0b1b3a9385213f597af03f4bb157a6a40c SHA-256: f17b62fa93b28541ef44b6febd7294c9b85c563977b1113a1dc4745ef5724bc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to obscure the final destination. The presence of these links and the overall structure indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e651c79ccfef20d73cb5a623779d3297/nusapagagag.pdf In PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/43115388773.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/37611413319.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/417618469cbd66f6230ab053e2ff708d/fekezuwikitolokuroj.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/25572171557.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/buwolekapobasirog.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/76027374560.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/50d60c35f62bfd7e36c9ef6141a3dec6/mozebefamapozawal.pdfIn PDF document text
    • https://baongochoa.com/upload/file/jejiv.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/17e28f2cfb1ff38c0f5befb1b8cadbab/gusuxenofafizeve.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/wufumosubokuzojoluzoj.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/15353887881.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/69e16d4257fec942ba253df058907d82/mixitofebefanewodetugopip.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tenavadelosatirabonigoso.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jb3vfb8g9djgbjt05lvst3cp0l/68171576636.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3559dda65855b29a9289a2b4f8b09c0c/25465238982.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160924b0e2509e---wuvaluv.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cf3c89256c29ade77f8d08a671ef011a/89851484104.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/taliroz.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/laxupa.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/99920485541.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/98894548361.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/02400faeffb7fd5cc8638ccf57052194/pemuwavumoj.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f0j96lse571b2jipdk6j611lqm/vadalukixesilimozisidudaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=microwave+candied+walnutsPDF 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_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 10608 bytes
SHA-256: a9ee54e519fc7bb891917a6555261c39dacae35e11d47350d309d5c6a2b90a91
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 17396 bytes
SHA-256: 5316a074f7c294e25e3d1ad10462c6b1e001ca8241d6b4c7446f36bdb3a43784
font_02_sfnt_off0001491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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