Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d868d534232428…

MALICIOUS

PDF

64.0 KB Created: 2021-09-27 12:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d91313adc85a17963e3a2b81b45df619 SHA-1: 131a412795047cb939e05fb6c1b3bed6acad8e1a SHA-256: 63d868d5342324286281b639384fa0d1a3005795a65d204c623a8bf2d01bcb4b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of distinct hosts, suggesting an attempt to distribute malicious content or phish users across various domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4869

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://wastran.ru/uplcv?utm_term=animal+farm+full+pdf PDF link annotation
    • https://pnp-studio.com/fckeditorfiles/file/janasefuzudunuparonarop.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/gufugaw.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/zokitigejutanod.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c12c907838e539e1d41b0f50f0eadf1/polomiluxajaxazaxekesutug.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/29901463490.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b57c653da7---jesasedikokoxuse.pdfIn PDF document text
    • http://le383.com/uploads/files/71394806424.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mowelusufifexiluvuradepi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138490513596---73631191585.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bd3f7a41f---13376651675.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/xujuxivusolep.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/38280756407.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/jebeveb.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/57224554628.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/suzafimaxupivalolasaf.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/edbc88c4752aa1d00a2ad818880d5109/83365109460.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/fuwajojerububofakowinite.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2kd6an82hre251tahr1o9jvlpj/gaxezamobaxixugurulelek.pdfIn PDF document text
    • https://rais.bg/uploads/file/nipemot.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/dowagavepisejetobonejib.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/wutetudonodo.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/2785314475.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9963383c3---muzelalem.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146194fbf272---84355753590.pdfIn PDF document text
    • http://anpharma.net/upload/files/tozewoge.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/49353182327.pdfIn PDF document text
    • 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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 10220 bytes
SHA-256: 1e1b725d50ab0d2e338d4351cc185f9c3c394d912d2d3ba7ef9dba8388f3cfa0
font_01_sfnt_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 16536 bytes
SHA-256: 86ada34f46b6966879e7dbf81e6d731736acf98db62fcf1af68208e67ffcbddb