Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b613dd6b8982f71…

MALICIOUS

PDF

66.5 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: 7435074c81dac3bc7ddd2dd2b59d6774 SHA-1: 990b4cb9214b0f9dce21ab70d1a2fa7a90a0b453 SHA-256: 9b613dd6b8982f71f277424753eaa4edb713884364562d1ce22a67b4e1379cb5
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous external URIs, many pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, limiting the analysis of its direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5557

Heuristics 5

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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