Malicious PDF — malware analysis report

Static analysis result for SHA-256 a633f4d0c8493cf9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 14:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 121c6c4577928c1df06357b1bfaee262 SHA-1: 2365237213dc3d1f5b47ce82b6d1c4a0d366c166 SHA-256: a633f4d0c8493cf9c5c7b5b82dfdaa7d447b518a95a9c724ae45c826462d87a6
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 are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to evade detection and distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://motiv8workout.com/up/files/93619345220.pdf In PDF document text
    • http://geofer.eu/userfiles/files/nekenomefifodixemizat.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/36276577303.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c15af792e0c321e60081cff86d5f843b/xoxem.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/12966889464.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/61810872101.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/xutadeguvuvaligu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb403629faa---kapofipufesuritixilewefe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b71409f039e---vafapuwurafafujekoluravut.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2bbe6c9597f198ffe4026094aea9d951/sirox.pdfIn PDF document text
    • http://geotersrl.it/file/49240389004.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/dca569378d43be5c7f02cba55171d430/41063528404.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28041596573.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a14c90d75fb63630bb39aedf487f2999/93390853194.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///rinogagimibizapojazujofor.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a4941c83---90270749490.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/nutunufudad.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/padekuluketuxadozep.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/92796120419.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/numeteloxosimawu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f85670bdd83---2928078151.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0edc3f96f---10238969547.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/70806947782.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/21251084316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=binary+and+hexadecimal+number+system+pdfPDF 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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 11272 bytes
SHA-256: 9a327cee8bda9af4a3a969c97c1d9d9e8fa6960463b2ed6301abeabadd4e71ec
font_02_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 17800 bytes
SHA-256: c3b2d4b306358283f1b8c55217fe2a1879cb3cc1a865fe466c751b3c7c7bcf6a

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