Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4468077aaed1f7c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 08:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9510d77b3087f99d465d4844fa523627 SHA-1: 77df888b2a8be190f7ebcb6901e089c5145d188e SHA-256: d4468077aaed1f7c4bc46336168a9b2ddfb5cb7638d9755233e7f91dd8f07ee3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password for it, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://techson-cctv.com/upload/file/neraravoxetazunazezava.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210514023410131486102.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/jowukemim.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/60861999862.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b9dcff019cc56c8089aea0bc03e9134/39129666330.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac954976c91---41947084156.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/id36abupba48ie0i098nv2j9q7/96812279950.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t2fu7ll61b7j5mge1tf2g274q0/buwaxutawosasitajeropa.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/wubukaviper.pdfIn PDF document text
    • http://beateromer.com/bilder/file/36418624798.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wigagukowufimawumomojizo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079f3da79---27484866542.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2517bddf0---nawoxejujamazobamowes.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qu1p9h0c2eukq4opt4csi12or2/6661638255.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/16771319892.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/58764915828.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/92507274870.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/60e90770d59e5cefd3a35f4929adbac3/nabod.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadba8e948c---toninexodamozisugizemone.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613066a961a15---jesila.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/levadukuna.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/48277796878.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/467997592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=extract+files+from+pdf+portfolioPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ef580a55bac80b3c91738a8b9e3aaddc/lubumo.pdfIn PDF document text
    • 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 10760 bytes
SHA-256: 631c44ae13d2d91ad1c480e0278e14588b54b5c7255e67bf1cbadcf6a68b3753
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 17184 bytes
SHA-256: fe3fb83e234910671aafb3fbd09af96851e5cfb722f3227c55d02bf9ccf891e7

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