Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8601f1a07449031…

MALICIOUS

PDF

128.8 KB Created: 2021-08-01 23:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d14419cbb184b80c724eb7848bc6dadd SHA-1: ef1fbf62cb02626c26d9e76dd4d368d0901b9114 SHA-256: c8601f1a07449031c4dfaddb9a3c1275f75fc77698b79a8e8d855f1ccbf2bdd3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/d8695fe96774abdd639601292c81518f/86206116199.pdf In PDF document text
    • http://sinsg.com/files/fckeditor/file/37247399881.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878e4bedaa3---mulasipamafujozinaw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hrtrdin38363er20ne2oca2bei/40436717908.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ce1285e8717fcdfa9ad8d3eb5e436029/77124974952.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/69499099865.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/gufarotesux.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/65b3281e470302705c067277de1a645f/10944396180.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3b1ba8749c614fd52a6dd0192c6cfa78/5539446239.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fa2ecfafc8419fb7b57f90305b692964/7952364944.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b114593e8a165db46710a178d3802fe5/kurubokidugikomumuzobibep.pdfIn PDF document text
    • http://htwy.com/upload/file/41092234856.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/43180156049.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/99770031157.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a06a5b0e27989d116fb4dd111392a061/detabotorefajoroz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7b04hdb0c53h5v5qgu41hr5j0b/60993244002.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/76061814357.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/satidowolafexos.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/74074171dcec2ea02822dba39536456e/mufiwesefevami.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea54623c8---94405207333.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fa5e6e683a23fdd3ccf33518d7ef3e9b/kinowox.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/20599066232.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/31100455174.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/45893488521.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd98c93051---2802545671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=far+cry+4+amita+or+sabal+no+spoilersPDF 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_off00018e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A63F 10844 bytes
SHA-256: 83ec4b9a15006ffd3dfe6389a520ed70d013ee3a187a23e96c1cbb975f364897
font_02_sfnt_off0001bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF22 20648 bytes
SHA-256: e3bc7d465d5427d2a769653088248357981bfeb67e5114cda9642a611def683b