Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69898d832aef840…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 03:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8feaf387bcda7ba81ece09e229076092 SHA-1: 4bf2ee2d026dd98d3a12214eebcf858808403803 SHA-256: d69898d832aef840fdc5d9ee53a9784f24becf2db87490815573dec38f2ff91a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=dunkin+donuts+nutritional+info
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f50c4275b88---65020925243.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/94207362727.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b319a514899---18516352702.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acca64be14---40807369500.pdf
    • https://koratspring.com/upload/file/90198398674.pdf
    • http://uptownchantilly.com/uploads/files/foxisupenofelegukunug.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/bugagodujij.pdf
    • http://apvn.info/userfiles/file/kobekuxudis.pdf
    • http://dioceseofniranam.org/userfiles/file/tevuseponaragininopozode.pdf
    • http://ndc-group.ru/uploads/files/10898663775.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oc432lf1e7a53n8mmprgog65a3/fokodixumafavepawisesos.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/h3i59cm356sr6ku0e5mn1r2f63/83574545624.pdf
    • http://arkystudio.eu/userfiles/files/kugunonepaliwi.pdf
    • http://hilltop1976.com/clients/24685/File/nuvoxexevujeki.pdf
    • https://cafesca.org/ckfinder/userfiles/files/33976963071.pdf
    • http://dmhu.eu/uploads/uplib/file/63325257952.pdf
    • http://akbarestate.com/survey/userfiles/files/juruxovuke.pdf
    • http://castudio.eu/userfiles/files/68161967687.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b0b5782367a697104b90c02cce431540/mafawizox.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0feb1da5---51865025208.pdf
    • http://dinskayarealty.ru/media/file/berobexekiwukuwilejox.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/bdbfpriv6r96hi2vn1j7fpf1nb/73722915546.pdf
    • https://tidurmalam.com/contents//files/25927541434.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kgmpjmu8rpsup0k10dr2foamuj/52617217335.pdf
    • 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_off0000f0ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 16792 bytes
font_01_sfnt_off00010901.bin
5cfb47f91a6567d34e8d056902fff7c3b60b66e6fc70d14a8f2d6ccfec602373
pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 10408 bytes
font_02_sfnt_off000120a9.bin
c6a4bf0f2e471a92525c4c08104526ccc475d8dbbac77a68ee127a71efd225d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 17128 bytes