Malicious PDF — malware analysis report

Static analysis result for SHA-256 35695329f6c7abe7…

MALICIOUS

PDF

101.7 KB Created: 2021-07-28 00:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23e57c5888bd6c566196ab5673e49d71 SHA-1: 3559e8dc9be8d4f9dd1ab5b71d5fad8520641f3e SHA-256: 35695329f6c7abe72743b4a214ec192b039a868f029a880e6c63143fc0bbafa4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.reenactmentmarket.eu/images/wyswig_images/file/nubaledodofa.pdf In PDF document text
    • http://farmina.ru/uploads/files/57410100201.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0edfc5aa02a12b51f1a4964e2a5cef30/jetinozat.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a6892079510857fc3fed7423f07b7f86/miduvesin.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610032cff3979---63264139437.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69747b6480---24009498210.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/53499960635.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87347202666.pdfIn PDF document text
    • https://topupdana.com/contents//files/vewugalenejo.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/63114918826.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/3bf78a232ff8705902188ceaf1c1d90f/dugudevaboxot.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/filatibobusedam.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vitibixinokabo.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jekegobideziduwok.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/23097980473.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/ruzoresavewaligetatagatu.pdfIn PDF document text
    • https://fototipia.hu/files/files/16757455179.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fadorerupiximijaxisele.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bed7aa4540b---lagemusopelaji.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f974e53a39---womofobifidinuf.pdfIn PDF document text
    • https://austarpharma.com/upload/files/32450240307.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/75569587169.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sadibujimoxefukog.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a745435d7---betiwilofef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=accident+report+online+abu+dhabiPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001562c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1562C 28216 bytes
SHA-256: 9092ac977ab6588a611e05b54869ecd5d8e71115f66ed11ee5801c7fac2c0f18
font_00_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 17396 bytes
SHA-256: 49797536e9f4490dfaa5fc3d5ff704fce353001242e33726fce4f0c6c7d75aad
font_02_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 10664 bytes
SHA-256: 2b0ed2bf5c2dffa52dee42348301cb8c8e064ac824db5f581c85973c5968093b

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