Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc03054ca91b3ae6…

MALICIOUS

PDF

95.4 KB Created: 2021-06-27 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1b058327c1a04524b1989a4639fa3e4 SHA-1: 65b8e4ec6685c56eefa42daf5406ce3d3d90f156 SHA-256: dc03054ca91b3ae69241f364aa6d4a956bed7d22602fd6f1ec0df11e4e7b40d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://akproauto.net/nbloom/fckuploads/file/pubodisufudovijumir.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d1dbce75---76609309640.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5e5ecf71256036dd9f75ade451b49b82/lokemi.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86eb57097---wunizakupidago.pdf
    • https://syntellect.ru/Repository/file/vamorupigofi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2236bd26---78853796926.pdf
    • http://travelshops.pl/userfiles/file/burogugoragivaponos.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099f96a9be58---fapuxokogonuredak.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a0b14dc82---wumiwasijezuvisafezapevav.pdf
    • http://4bx.pl/public/file/deweke.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddd8292ca---89718730902.pdf
    • http://gialtour.it/themes/userfiles//files/zufadufowomuxola.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/auqjdg8v1dl9evmij0fnsfq6q3/47100708829.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd775dff37---sivupitipanoxumorefozit.pdf
    • https://reparationmobile.net/userfiles/file/fitesoxedavutigusalipife.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c368927110---rujowuzazotapidetopeb.pdf
    • http://seyrimerdin.com/userfiles/file/62779135247.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/74106129084.pdf
    • http://namuvaldymas.lt/userfiles/file/75794233110.pdf
    • https://108pizza.pl/uploads/userfiles/files/bikexuj.pdf
    • http://brmxn.com/userfiles/file/20210613135123_kzupw2.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d40d1870d8a230387826c10374d82cc0/96156182643.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6099e72b3---55271669456.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawosexinakupowobasixobir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=indifference+curve+grapher
    • 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_off000110aa.bin
bcc9cb3be5db3d261be0d57fe24655bfb72816f0bf3d199ff08e138cc3a350d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 10584 bytes
font_01_sfnt_off00012883.bin
4c287db43a1ee010d1b69db62391ffc1a505e878023711776989a52b31f01629
pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 18116 bytes
font_02_sfnt_off00015858.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 16792 bytes