Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dd4209a7186029…

MALICIOUS

PDF

84.0 KB Created: 2021-08-27 22:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f629f01e85aa0276d30d99132b259e80 SHA-1: 2bcb1a06a3351d9d0b8b6fbbbc9a4fc4f863ed96 SHA-256: 97dd4209a7186029786bae4d8881c920c1042509f8b2d8a313c814846c7b8a44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to download further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking on these links by posing as an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/600da89731378f3f359b3d91c8e479ce/vuzofizowomojosolekede.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/uvv9bbjdtp3tcessfbmhgr60hv/78480057955.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/7710357247.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/42119049632.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/94780918556.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf28d0ad43c---bawimibakejo.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1629409051.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/jurubatage.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5ac77a3b5---15787961624.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/vilagiwutexegejuwuje.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/46414577264.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/wabasuvesexexusiwo.pdfIn PDF document text
    • http://szpk.hu/_user/file/42709549319.pdfIn PDF document text
    • http://sbairs.com/datas/files/kabivipigitimigigoke.pdfIn PDF document text
    • https://eetravel.net/file/36099006680.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0bfbd1ab9---venebapokazovuwerodor.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/gujad.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0a8q9r1cg74dhm9qm9g0l2qkg1/wekipifoxofadijomen.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5a24eba5---levoz.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/pipuregifarolapasokamagu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9jr8sq6o76uaf536e2iceddbnf/bobetitipodevimuvolovib.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/46988466426.pdfIn PDF document text
    • http://servmed.net/userfiles/file/rubukadizeg.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/ruponufitin.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/31210472118.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9e0029f6---tufiwolotuziman.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e78a6895b62---baninaximodus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=accounts+payable+and+accrued+liabilitiesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e8fc677263d70a2de7077ca241da8b84/netotekoxumumibegit.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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 10844 bytes
SHA-256: 38253f7808c368392635562c0c1bc30b958e3855557f93137d0d43517154fcaf
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 18192 bytes
SHA-256: ee2c553563eac0b8a95ac76f2d75ac8c49b6f0dbb886afa83f2f27df4ecc91b0

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