Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5aafe834aa500d…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 01:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c86c2eec418284a1dc276e178d3736 SHA-1: 270b27d5f6360d88bab3fe1abdab1e30c8ec95b5 SHA-256: ff5aafe834aa500de5724023e8e751b33d7bc91bf34e3055559c2c0e2dc1a909
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=stock+sell+limit+vs+stop PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/adb7dbb21f97dbd29e6e26c3ef466028/wapemikolasok.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb5f272977---54563052325.pdfPDF link annotation
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f159482a5---2249843483.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/40394039239.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc555ddfa---7074787680.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9a36fba1c6f10978537898ed83e450fb/85529612407.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sexizademororobirezega.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/e219ea4b8c17c20cd84f70eb1bd947fe/kuwibegidizerujox.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/27914703460.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/turilavitawowi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aec2a54c4d2---75907045952.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/48064677367.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/15015026685.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca06e4253---nesonefevonedakemunegiw.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xixesineli.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fe6af54651f10d7571276f01d3f60e27/58784003556.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/sojig.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/pefukasu.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/rexatofolewutosu.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/10413898725.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16090999d50247---lewakojukodeximikijebe.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/11951877173.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/liwetup.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/22b7446754181c5c515c5c00a75b05c1/43540218835.pdfIn PDF document text
    • http://candientuvibra.com/images/file/72285741492.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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10404 bytes
SHA-256: f58f841089bd1bdf2a6a1856da198040c616338e154913e29e9054b252e757e5
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 16720 bytes
SHA-256: 2219be753a64cca1a92ce9f18122934bd0333850ba2a373b0eeddd8a8972c7a4
font_02_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1