Malicious PDF — malware analysis report

Static analysis result for SHA-256 8744d9403d0973b1…

MALICIOUS

PDF

86.4 KB Created: 2021-07-28 04:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e2b1655904ddef90633043d1ef86ecd SHA-1: 37664ee3c677741ee0460b0a1e04a4b8bd9c7344 SHA-256: 8744d9403d0973b1094e7596b2daffc187cd86b1a6548beabf2cc509b90863fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. This structure suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://dooroc.com/tk/upload/file/17410670878.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/167bmhumpeg9at0g7cm90u0nj4/gofijujakejitiduxipa.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/29856150754.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e2e6174eb62f1d95eeb3095c96df5f7/xiruwurow.pdfIn PDF document text
    • https://rm-parketi.si/uploads/majevulirokekoto.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d390e12efcd---68007622281.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210623225015.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/81023406989.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6535407a4a8297134f2aab77421d83cb/73896111366.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vm5mmoe6gumvsrv06nc02intqe/39332350451.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/10338625449.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aedf899c9---53528724869.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b877ac99344657f86856adb21c2af5e/laribeferezegato.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/23653544107.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/pasoxotoge.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/57ba54e3329ba9c61753c2ec24e23d7d/1209894609.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b365b0cc73---32390358936.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ecd6cda6---92957677414.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/golakakulebujoxubagavija.pdfIn PDF document text
    • http://bio86.fr/fichiers/jilovotasidile.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f9ccff9b4cd7b3f86fe00c705b6d6f29/zeroxawoteto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=scary+movie+1+full+movie+in+hindi+dubbed+download+mp4PDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 11328 bytes
SHA-256: fbc7c979ab44d820eb2a6f4d875e6c73e84b34027c23f76dbfb77ceeb1a55db5
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 18260 bytes
SHA-256: 9b6858acd985832cdcb9840b8bb805a4b0a54c798fbd3af72dcc092311597c8b

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