Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fb6e67782f4fa4…

MALICIOUS

PDF

93.9 KB Created: 2021-08-06 14:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94135dec513b64980c34e4e5e00863cb SHA-1: 78db6adc1f3782e360e1030b68d33f8cc9072142 SHA-256: 75fb6e67782f4fa45c910103210aa33202f76c7152b0eb6fc7593414fee72d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://elitstroycraft.ru/source/file/funole.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/betitirovewezupopodow.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607491e1152d6---95267332392.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/37865805836.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c672137f91---dosoxegunezigewi.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa439ce498b---fovoxaben.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/fixevuturodapez.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/75192057237.pdfIn PDF document text
    • https://amblamy.ee/upload/file/nifabonuxebomidodo.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/jisemeresajujezafufar.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1jl3jtqdcc51774cv92elu4m98/xoweguwakemorewos.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160feb73c452a6---90370420936.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/92335900379.pdfIn PDF document text
    • http://stillwaiting.org/userfiles/file/45212493266.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/5449020546.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210605_215417.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/95cvj2i580p4fl5m7nfliesa0q/kinufovararurek.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e05c1b73630---dilesek.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/13210333735.pdfIn PDF document text
    • http://www.77ice.com/upload/files/65062547623.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vanabora.pdfIn PDF document text
    • http://palet-school.com/files/files/kebutixinewuwutilaku.pdfIn PDF document text
    • http://cga82.com/admin/File/vejiraseta.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3b785bfa---91677891659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=curso+basico+de+guitarra+espa%C3%B1ola+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_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 18048 bytes
SHA-256: bdef40da2ae5508418260d24af480043878cadb00e275752ec061e0ae92275d2
font_02_sfnt_off00014ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 11168 bytes
SHA-256: 42a0a2f890ec04498311a285c1c97954f483b9750eaa78e9a7c320c0a4fbd86f