Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef9880f7f733e16…

MALICIOUS

PDF

84.9 KB Created: 2021-08-19 14:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0b4da10ed606799062f2b061ecc6ade SHA-1: af96be8995ce51bc4d0f8235b2b3d426800674af SHA-256: bef9880f7f733e163e53fd77fa11a746c76c5ef2e46f0c1ede7019ab69763571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=netacad+it+essentials+chapter+3+answers PDF link annotation
    • http://myblindz.com/fck_user_files/file/roxawib.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/jogox.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/62662259224.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pivesazekanamiwi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/rimaruvele.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/309a6da524a9670e2a3695a97f8829e7/minowedewawamezozuxavef.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/62079268581.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9oi61ubtu4sg6cni6a61qdugb6/51607122608.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2ajknp744hpfgccjvphdsghpte/15994609417.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/11432696226.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/42268037211.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e3d2a2cb160ef9fc32b1a3a5b66c8672/dozewixizetodu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6f7374dd859dfcfd3db975b5e6c64fc3/raxegomononumibi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a30bf01285cdfbd7aecb9b0b0b8c16fe/54098407789.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fdc288675---47183228483.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/mj19ji6pfq6ov8f5u95jmo5qpq/xigogezot.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce235b19a5---73380923748.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/09def81f30f41e68e6b5467b8d95f8fa/naribebib.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ba8b3b65---20911984321.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/56443384760.pdfIn PDF document text
    • https://mvservice.it/file/jojekugekuxe.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f622844e---kizomupekuniwotowojofero.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a1042bbc9---31852804086.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mhi21e814q3loumu7de6h8lfe5/43208767201.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10724 bytes
SHA-256: fcfe14de5a38e05a83363a07d98cf91e7dcd1141941e7a2972b142d12a0ce722
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 16440 bytes
SHA-256: 87c312d8bf80b5e047867aafc931a74a7f583f233b0bdc531a41e57a6f997f66