Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8378e9d14cd853…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32c0e6c9d49e65e26b61bcf97d67d79d SHA-1: e4be8747f0671a06dd18007682345c7df65d07fa SHA-256: ac8378e9d14cd8536aac7a25aeb36ea48902d641ed8f0f8e40f2f1cef497072a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ferest.ro/imagini_ws/29280715724.pdf
    • https://vibanghanoi.com/uploads/files/29422310480.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfcc14161b---mododatidogibabupe.pdf
    • http://taxicityplus.ru/userfiles/file/wewezazomuvomuwezep.pdf
    • https://bushregenerators.net/userfiles/files/11076282038.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/46750182421.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ni9700r0mgqva22o1ue45vk1j6/dupitumobir.pdf
    • http://salsainkonstanz.de/media/files/2758086657.pdf
    • http://belean.pl/userfiles/file/vupow.pdf
    • http://www.tramag.pl/upload/file/63010866281.pdf
    • http://kiko168.com/UploadFile/file/20210905045232820.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/68424362244.pdf
    • https://kingdomofgodmn.org/userfiles/files/xepiz.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/008e6962fc1718c993564397f94954f4/3659395588.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff154028db---4510786339.pdf
    • http://sungsam.net/userData/board/file/wefezawugezizupodomedi.pdf
    • http://monkey-do.net/userfiles/file/wekupomuberenuzonexubi.pdf
    • https://kaisar168.com/contents/files/gagufotewuvakovita.pdf
    • http://swotaweb.com/img/upload/file/77269292262.pdf
    • http://szyqjsj.com/UploadFile/file/20210916061835542.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef59c1701---magataxovemavaler.pdf
    • https://larrialdiak.es/files/galeria/files/kevuxemitajufag.pdf
    • https://its-bulgaria.bg/files/file/piwapibud.pdf
    • http://travel-door.com/userfiles/file/72938975015.pdf
    • https://clubslotalmatriche.com/calcas/file/33802601354.pdf
    • https://kcharp.com/ckfinder/userfiles/files/xefazorinutixadun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+update+a+tablet
    • 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_off0000dddf.bin
8f19eeb6b57e7ae3796491915dfb83ee52e66be920a1fdb711c702d2a93dd70e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10352 bytes
font_01_sfnt_off0000f533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 16792 bytes
font_02_sfnt_off00010d45.bin
c3015e13ed8bbce264b099390df5fd9a996f6f61ffa5d6b86c1334f3741e3717
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 20092 bytes