Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48b5d0c3631e979…

MALICIOUS

PDF

97.6 KB Created: 2021-06-26 10:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67a4d94cd55e532e9303ea88649a48aa SHA-1: 9a4ed925c4b67f744e491d131a2d617bbf59aa54 SHA-256: c48b5d0c3631e979240ffd7faad404e70ca13386011882b2184e6fb2868f23d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the exploitation of PDF vulnerabilities or social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://rld-carbon.ru/file/75062068035.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/39552896292.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/tuparoxow.pdf
    • https://ludifrance.fr/userfiles/file/15011268202.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a1ffb3915753c934945b5425eb16fe22/dukemelavowirivupid.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c80b0f664.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/dikes.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5a1a374c8692f3c470171fde0d07ef60/letupowotetiwin.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851892f101---77849148746.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1c532d6193af432f3f18aaa3a2372ed7/wakajo.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9fcc6d16---30398711841.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060822494080554.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607822f288dbe---26708200405.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76a6c1e667cc97f4e707a4f642a03043/virajofamasilomanowo.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c582a98eec2dbec8677b36402e62f123/jedusoliwufox.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c85a5dfe---mavuzolamegixokesube.pdf
    • http://blueyee.com/upload/file/201104469324.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b2aacaf5dd68a84a6e160527844d1de9/65795480131.pdf
    • http://primaria-ciocirlia.ro/media/file/jujanojedilipi.pdf
    • http://inezorviskids.com/clients/37546/File/geriverufidovusa.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ecfddcd5d42d5a002b6c8f50e7fc26fa/57384287496.pdf
    • http://stroisvias.ru/userfiles/file/47857945416.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/456f5e3d6d42e67127cad584c0056ede/85421631106.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d6b2f145856b9379ee35d3b15c663de9/jovuxawipasutibof.pdf
    • http://ajtoablakcentrum.com/_user/file/35107882055.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=a+rose+by+emily+dickinson
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4a.bin
2a3d05a3459964675a074de976c1c0245b6de08a72dc9da98a5c1a22ab561179
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 27148 bytes
font_01_sfnt_off00011aed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16792 bytes
font_02_sfnt_off000132ff.bin
ab6ee044bf49b5bd3cec3f4bd91b575116691b3885e57b27f79a4549682b608a
pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 17104 bytes
font_03_sfnt_off00015f72.bin
b4cdb260d886c68496634e1a9d37ef2d97fbd01c95a42ff7141a5138f24ccb2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F72 10600 bytes