Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e45e7c2feb87662…

MALICIOUS

PDF

91.1 KB Created: 2021-07-25 03:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40fba339807d0ca4d3ff4b3c3294a2e1 SHA-1: 28b53a1f2449506521dd417ee643c340903a37b9 SHA-256: 8e45e7c2feb876629395fb2e5c90ad4dcc498afe05274094a64734b8e23519b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of multiple external URIs and link farm heuristics indicates a pattern of redirecting users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868ddeda1be---83841528638.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379cfe0711---73226949632.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/37830de418967c43e95fb681ddc7721c/wegikutodowe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072169b36fad---96031628020.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/fewibat.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/bad377a4afb30cef10faf9ae72b939ae/99660110707.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/29326413459.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/89192517937.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/tabubuso.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/1380602598.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/60114847615.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607071a32b84a---26319469647.pdfIn PDF document text
    • http://c-amc.com/upload/files/kisunupizoko.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791484a80---35113897261.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/53866446814.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uathchns35mlvaodv77s1sv095/55078133169.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c7c35497c---wufeziwudazilibe.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160968d4768f00---muxanujopefolujiz.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b938133bba04e2c77fc2678d38a86c39/bubifirukeb.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/63550746705.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/paziguvedomagisidop.pdfIn PDF document text
    • http://chinalabware.es/d/files/wobepojuwizida.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n4spkmd9eeonjjvp9g27q5hm51/71238361445.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/20510303200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rpg+maker+mv+tutorial+battlePDF 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_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16920 bytes
SHA-256: 6b1a022c098c5ae3c4114655ba952272063ab8c060a0c5034ad49dd53da13cc9
font_01_sfnt_off00012d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001455c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455C 10764 bytes
SHA-256: d447460ca0e807a783a23cb6c2163b5e957a12270fdd4b626485dc0c296674ab

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