Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fdba5436c2b1db…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 08:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1ffdbf94239831b7918e742b3619cd3 SHA-1: b900374446dcfcf571968bd0f558450f709f2a11 SHA-256: f5fdba5436c2b1db5f26a245ec4f3a6221283d48793757699aa555bd6003a303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam lure, likely intended to lead users to download additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080df5a2f1d0---89366562908.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160939fb7433a1---kogokikukorokenoboseku.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d4a014c0---73945783136.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867dfd8ffd0---35017376075.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbb8cca69---dinudus.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c09fd4dc88e17bb28f6a4aad32f9eb1c/44089413828.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160755cd60434c---dazorabogagilezedavi.pdf
    • http://agataklimowska.pl/userfiles/file/99025466205.pdf
    • https://dalton-english.com/userfiles/file/wuxopukavojijivil.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05d97e583---1678283146.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607898a4e4a8e---tuwanovawi.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609831d5ea021---40663594097.pdf
    • https://facades-et-traditions.com/actualites/file/buzakunekejowe.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0b6f5c0d65e05847e31b22b6d293022/migugitufafadifokoj.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/03b9176a42e49232fe5f629be374f160/xesezubotexop.pdf
    • http://menafundinfo.com/userfiles/file/getuxuxofawuwina.pdf
    • http://anandtouristcorporation.com/uploads/wisekelotanamugazeliri.pdf
    • https://liniagdanskzydowo.pl/files/44436589095.pdf
    • http://adhdesign.de/userContent/files/20210607122017-lukaxerezaxeluzubov.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/752904c48813557412359ba462faad03/30151709216.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30b5b6161---mubuzupetupalutu.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160901f84b7992---wofakesudivupajivani.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ed7jv7th58i3avviutairse761/butovage.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=solving+equations+using+fractions
    • 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_off0000f0ac.bin
f4344422e1fbd64369a9d859b4a6c5d27d5c5e30ac71ec7547dd91cfecfc4fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17344 bytes
font_01_sfnt_off00011e50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
font_02_sfnt_off00013667.bin
48a1f192d0bcb8d5679658bc023ca192805f7345e5c6393cd42ea233b06373bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 10900 bytes