Malicious PDF — malware analysis report

Static analysis result for SHA-256 173a54702e526bf2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 10:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1ba8d3deb3e02448704ec9b73085663 SHA-1: 61a65581ef2d9e07872d843491580af23bc53848 SHA-256: 173a54702e526bf256cc0737ac230474c1bbfc9169772eddd8fa8a64e94ba643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting given the 'passport form' lure. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dichvuketoansg.com/luutru/files/4017181563.pdf In PDF document text
    • https://goldenapp.net/file/jasuj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ec973a44---74949748816.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656709da3e---84672383949.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/65659516003.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/36959929377.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gulupilufusatunezelapasun.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7929d592ec336e4a319d701ea905a070/gesegetenoviwi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109b9e85cdb4---99174341787.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kn06ultm0fr73uq6plounabljv/5940843680.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nulorofomudebobuj.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/wilalesatakuvapuduwirize.pdfIn PDF document text
    • https://autopratichesas.it/file/tolizutosejuraralujuv.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/gefunef.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9bcd7617c---56332425740.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/87598230236.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0f627528054c77b783421b4ab1b250c3/13295107942.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf9dc4236---nenukupalibubuxuxi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/xivuwilovi.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/tukemobewenumowe.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160898db95f99d---gatonagun.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c66e4cf37233d6a545998f7df1257fb4/figagopekewoparebisepunu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608864d17561c---60009768509.pdfIn PDF document text
    • http://aven.su/userfiles/file/lejanaju.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/76041336186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=passport+form+pdf+ukPDF 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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 10480 bytes
SHA-256: a5b356c475662970a594282bfd6441d6af3025a43c2ee750de5313b65f748fc1
font_01_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 17472 bytes
SHA-256: 070cdcb26e38a8fda38e8d310a9693dca4deb239d35db1f8486cbda368d78193