Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85ccc3856cf1c4d…

MALICIOUS

PDF

95.5 KB Created: 2021-09-09 11:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34157b88fc59e46f01b4075720c3e3c5 SHA-1: 3b8ba2d3a53eb0278bdfd6b8cb6575e1870d3613 SHA-256: b85ccc3856cf1c4d1cb8daf548e793580a68cbdf9c895e3a889c7fe78fab5fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly but serve as lures to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf94406ee---90202084096.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0425c03ec8f6750799997eec3891d99d/nelisagut.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/98537963445.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/lewosogudorotevonud.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/tudil.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/25813356755.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109030456326090.pdfIn PDF document text
    • http://theponghop.com/upload/files/93173059838.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/66921038064.pdfIn PDF document text
    • http://klhl.com/userfiles/file/duvix.pdfIn PDF document text
    • http://ruresept.ru/files/file/79171030510.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/26826719952.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311837e58e6---74298016371.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/gobekufarebemajilef.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/sudezimotefedome.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jilasenum.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/30993581753.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/nupuruxaz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d70a672daef07f976de271498ded2d19/vuvipisakana.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/84085527709.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/litufo.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/bopeloxex.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xapuzobafimifinosivugo.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/memizisufokunedukewelug.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/fadalewerijofofoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=after+we+collided+movie+123PDF 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_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 19756 bytes
SHA-256: 2ef4f2e4a59f04f48dcafd6810ed5f4e45c7232506611e768b60ed85e8df4bdf
font_01_sfnt_off00013f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001576c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576C 10680 bytes
SHA-256: e608f2e9cb3e9eb2998e008a797c7a476539fe326967e92a0ba5ab33612753f7

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