Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd3e5e3baf892b0…

MALICIOUS

PDF

68.5 KB Created: 2021-09-13 19:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 426202e86f0e12fc67f3d02e2e13bfc4 SHA-1: 6d2fb7cec9d11edaf09ef68b5c67e2db254f598c SHA-256: cbd3e5e3baf892b0837c2bd23d73274655bf12e0d0d5977b44e21a33f1df675b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=carx+cars+in+real+life PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3868f2d04---82129607097.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25605632576.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/duguratokimuf.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/40495412443.pdfIn PDF document text
    • http://gabortech.com/admin/file/baxuravumusarirenuga.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/69781382249.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09186f25f---85385106390.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lademonidogowe.pdfIn PDF document text
    • https://petala.gr/userfiles/file/72909194912.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/sepofamadupejomo.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/40677914693.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zomeserigokapeguzutefi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/32747728244.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ralisepujedamatamowupa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9112df1b---58951443526.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/zududisimewifakexusava.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/wezakijebuta.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/51955142407.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sugedunekenuv.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wikuvex.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/mavafunoxidekef.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/nutezesajeturinoguxaxodu.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/gijibagenapufufutudibiva.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 14444 bytes
SHA-256: e35b39ad4c273307bff07f88db3984ae382de75de283f8475db3ed32a4c5c46b
font_01_sfnt_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 10244 bytes
SHA-256: 070356ec36c1b4a3364eeb31df9f33a4aeeaf1674af2b72eccab0ec3384bc8dc
font_02_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1