Malicious PDF — malware analysis report

Static analysis result for SHA-256 f730e7cd1699d17b…

MALICIOUS

PDF

94.8 KB Created: 2021-06-28 04:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c256d2151ebeabee2f25ea690c62c124 SHA-1: 1b7445c75d9ab60b89158f04ac5acda6c37e4487 SHA-256: f730e7cd1699d17bee99c43c08312f87890ad5c0d4a207f2a9c43a1961b90899
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with numerous unknown URLs, strongly suggests the document's purpose is to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cc5d6d03153105df6866e479d8a1a8ec/latimexusugosulalaxisinen.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3c31e3036bfa5125146f820a0208b927/63888897288.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d236a11e5677dabcbabd0175a15e1f8/sebukipezaniregolos.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3ad31a9a---siruz.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/847df983f4129fc5b7cd7e8678b737d1/96586774543.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b564a55e7e426fafe38ea5320243eacf/getamilososufibafujo.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/90716114169.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9fb8173c---vonaxejinoranub.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210619_7114036804547F16.pdf
    • http://turagent007.ru/userfiles/file/48229806847.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa9a4178d---75364875706.pdf
    • https://ludifrance.fr/userfiles/file/4076123066.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1255d9c996b09c103e99634313d83a27/27926346185.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c298cd1ac0---38898629271.pdf
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/22005809004.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/bavevejizedapiran.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/lawuvepobizalekufi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ooa1a9878pvm37nnoglkdjq7q2/36431542060.pdf
    • http://hongdacable.com/d/files/nukenaxudixofakixuwa.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9e5ce94ac77147c3e5381fd485f5a29f/xakuwekibijadelo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523a46cd03---7333424815.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81e714e35---37992205177.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537f5c51c9---pepidobudevinezu.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/is61ohu6qh6judj53l0oejn0g4/5315199038.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502013419430520.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rtgluk3ogqo4s27req986929k1/figevumumizilisidinide.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=structural+steel+connections
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd3.bin
7fe32a8dfcfe3f9799e8c4986b0c90ce98893ee54b16bf9027debaf90ac5cf47
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 10400 bytes
font_01_sfnt_off00012572.bin
edfe14d710f744fb161c5cf621d316564d9a347dca541b500695d167f6eccdce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 18940 bytes
font_02_sfnt_off000155d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155D4 16792 bytes