Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31f94fadb9a6b8f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 21:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ed3b46b497c90eb4cf9a417e2fb37fa SHA-1: 02ad18266a2d55299fec6670a288d1ea3e147566 SHA-256: c31f94fadb9a6b8f31ef382d83415db0063b97637177b7447fd40f9dece053dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://2ds-creations.fr/userfiles/file/37229225425.pdf In PDF document text
    • http://marta-galan.com/files/varios/file/11719560349.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/vejod.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613383b35b4b9---razabanivemetojanamoba.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/54330303062.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/vazajisumiwiwepeve.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jujaguditavagezu.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/62833220091.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/22070234169.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/damovikawiwusagonukub.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulilaxarubo.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/83371408407.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/54656351751.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/44383251586.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/livelivexi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/xifudupafafosudelogufav.pdfIn PDF document text
    • http://benrassam.com/uploads/files/53974459380.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd88961a3---35421694850.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342a238ffd---guwufajajif.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sogijusofovomefupas.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/posumofizivuta.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51882624603.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2a86205f---321649866.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_7867D9CEEF9C5F94.pdfIn PDF document text
    • http://juha.be/_files/file/74763142950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=redmi+note+9s+microphone+problemPDF 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_off0000baf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16400 bytes
SHA-256: 4da32f87a2c673af3dc3f9f0218814c26285345ea25306d8a74bc8501300e058
font_02_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10972 bytes
SHA-256: 6ff5d04f6beba54022fb071b8479bd100f512be0ded2bff425b1db8d6eb500a7