Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a3722263fa18d5…

MALICIOUS

PDF

91.0 KB Created: 2021-08-07 04:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e24f5bf092819b0060747c3d12c5b277 SHA-1: 294b54cb23eb7d2253e506612e0e2e7100110744 SHA-256: d4a3722263fa18d5653aeb7fece8571e0020ee3de5786b9fbdb18b15fc3e6214
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=basic+spoken+english+for+beginners+pdf PDF link annotation
    • http://ideas4mypool.com/userfiles/file/26075858248.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/81051481579.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/33267354044.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/fovidaw.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2edf2fe1c6131ef1f30954cac64d6fc3/tumilodiv.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/69406530110.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bivobe.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a817f4d2358---wuwamosoruxajorofidojoz.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/af5a4b4fba2a4ef6e7451d9da0112440/fuzotidobifiwab.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/weneraf.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/54204754636.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/613iv5k9oa5sokd0pijf9t36pn/negipux.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jamasidafif.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/41501611660.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/71479409806.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/2793775433.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/2951581142.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kl1huv6g70q10qa3lsk6s5d496/jivix.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/malubixotubuxuguliwerabib.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/kivaxusilamivepilezirepa.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/473cb369adbd2942d754783aec3e1500/351710098.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78500300482.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/kofajowetes.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/eea846a2c7a4ce301cc96437187b6d07/52025701026.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/jemupimujupo.pdfIn PDF document text
    • 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_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16904 bytes
SHA-256: e0391f436a37274cf869a125ede38838d10fcb060ad43dee67700e196043c1d4
font_01_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 11084 bytes
SHA-256: 25d3aa15911c0df94c18545e0df8e264067268048ef64ad53abad54db780e338
font_02_sfnt_off0001461f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1