Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c44be69f045aa58…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 05:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f13d1eaf56991cfe50c08ae07c631f2e SHA-1: 765a57fc4a3accd3d348660098547f5b7ba61c7a SHA-256: 7c44be69f045aa58e17976419edf20bb3327f7041eba31688f867d2331370744
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL analysis point to a common tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://buddhavehicle.com/userfiles/file/ninofukubo.pdf In PDF document text
    • http://www.kilincsweb.hu/fileok/file/87917184748.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/figufujeworerurelij.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/52486706263.pdfIn PDF document text
    • http://altinay-law.com/images/file/sikubudutupu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5a083bd558475484e2eea937d1f3164f/werego.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/50525003527.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16125fe443cacc---23264401361.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2429ebb2---85658710685.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/sabokepisapokavimibopow.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/79655342361.pdfIn PDF document text
    • http://rld-carbon.ru/file/zozupiguwejiwoguxow.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d63a0f27a---jasibejapex.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035d4f65e8d---kukiwemuwabizetujemobogil.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/vifivaguzerebopilotor.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/53043697745.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/9819661987.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sowip.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/tabexun.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c55fe7443fc---ravanevubizuwazuripef.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2d0feb9---dikija.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/juxonajokasadatobor.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16125e262dde63---gewawuwemafopoxekanekutel.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qpl88h85el2tn99va94sjbq6oo/10173387880.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/70465872117.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/53bb2868faadff65dc7663c94b79dfe1/90390911830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rule+of+law+and+administrative+law+pdfPDF 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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10956 bytes
SHA-256: dda99106830c47356da8601ea5734915aef002abc1b4e9e3d8a1bcb7f527b465
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 17888 bytes
SHA-256: 6fc402b43536cb3b7d5f96fb024ca1d317247b8624f83beb404c84680f5972ed
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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