Malicious PDF — malware analysis report

Static analysis result for SHA-256 744baeb1732ae026…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 04:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 468f8c872206691baea1ef05980ba6d6 SHA-1: 56af417aeb6c9aba1fb944348edefce7a71df3da SHA-256: 744baeb1732ae02687ccf2db064197ee9f7be013eca483f8c0c1475e7aa861cd
184 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and potentially disposable hosting. The presence of an IP address literal in a URI further supports the malicious nature, suggesting direct access to potentially malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bulk-supplies.com/userfiles/file/dibomuwopebosomim.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c8708530931---jetigoz.pdfPDF link annotation
    • http://perles-del-beya.com/userfiles/file/sunivafuzimesezi.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/65656409840.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/38cb73238b61c0a302b9b84d108922c8/bexidudujal.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/70348131764.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55eedc856---logozenigaxorivovoboz.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828040797e---lizudewakewajob.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/dozawoxux.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/zuzakodadepubumadulupuno.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/perofopubarito.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/totometofumefadu.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/57614236302.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/rovolumamimozov.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/libakowiz.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/eb5699310e722c5657821794a2fa0a01/60321655562.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/8506065559.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/74676550417.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/debobutubixunupelime.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/dokujetiliwugekuna.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/47322785625.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e0a14c04cd9ddb89e4dcfda351fa2959/61873519658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hurry+up+and+wait+militaryPDF 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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 10424 bytes
SHA-256: 0d75afec0622b35d386ef353be6b742d36302a5f3e9f44b31eb4033c9be5becf
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 18468 bytes
SHA-256: a515fc05f6d5cafe22273593bab7f66c5d8916bdc9e90f0f953f33aab3f35931

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