Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb9c1409ad01d6f…

MALICIOUS

PDF

75.4 KB Created: 2021-08-30 12:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 918d98a4b7cb3a29b4ad0d0282520361 SHA-1: cd288c11d9eda5bd6a6b5654bd08b143a5fb3b3a SHA-256: ffb9c1409ad01d6f19986b0e040ce12d7ddf4b831b70b4a0aca0dbf9de1f39c3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c639b2b69ea---pewuxomeninalevonufat.pdf In PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/gazinux.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/71313859810.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/39668197767.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/mexewemanuledurizap.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/vezodexidavavisonakir.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0799222d---bivukuzifuz.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/dulefaguwomeja.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59036370958.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/eeb7ff8742420a224fb78667228b04f7/52131600460.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/81316731894.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/45b8be6bbe53a9a95e88ef28c57adebc/18050450783.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68246c3829---32055123967.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/zixizudajonevesus.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/xujupavibano.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/87110211537.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/54230011590.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9cc0e6ec---82031043414.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pio4dbp7199uabnab8chr3al2q/nojixogize.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2b2ff786c79c2d69718ad69573c5dab4/sifivukinazisumapikuzew.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/2132703836.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/gutuwerogawujoxo.pdfIn PDF document text
    • http://remobudostol.pl/pliki/75349748373.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c89fa93f6---pawaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=play+tank+trouble+2PDF 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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 10408 bytes
SHA-256: 03dbe3a099173a734695126219b08191c6334e021e0c9559b53655c55c405786
font_01_sfnt_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 17356 bytes
SHA-256: c41a165115d93855c25488fd0b2edf6e7ce06117af597c1cafba344e5e794872