Malicious PDF — malware analysis report

Static analysis result for SHA-256 0478eb420a6c031f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 14:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0205ddfa0d61f5e8a670383156e12d7c SHA-1: db6dfe603747f5a1a7325ac18780c27990fe6ae0 SHA-256: 0478eb420a6c031f94626d2113580c31a2a4ff5bfd5ace913604ee00a1c8c1e5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=latest+bollywood+hollywood+dvdrip
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/06264480f3567517e2cd77c7b1549e0c/19887927771.pdf
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdf
    • https://aldapa.eus/files/galeria/files/86469484770.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/bifudubinuvuxedefenibo.pdf
    • https://ceccargiurgiu.ro/userfiles/file/fakotitadufirixuta.pdf
    • https://hkpefa.org/editor_upload/file/81120618502.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305fa8c303c---76026426993.pdf
    • http://pwmtqatar.net/userfiles/file/tapezetadifejarubiton.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f12746d204cf53245fc465b1aac531f6/97034513101.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/gurog.pdf
    • http://babijie.com/upload_fck/file/2021-9-8/20210908052704225908.pdf
    • http://hc6999.com/userfiles/files/wobereseroxixolume.pdf
    • https://calienglish.com/ckfinder/images_store/files/74615542394.pdf
    • https://stradatextiles.com/upload/ckfinder/files/darenadelasumupenakivi.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ab20dd5e5ce74b505012ac3e49935f5/fesonapozixa.pdf
    • http://datacomsystems.cz/userfiles/file/luzegeribunirejubosogis.pdf
    • http://mesterteto.hu/userfiles/file/98346403688.pdf
    • https://beldapin.com/calisma2/files/uploads/24398170149.pdf
    • http://bsinteriordesigner.com/userfiles/files/5593555681.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907040407849875.pdf
    • https://robindayne.com/ckfinder/userfiles/files/82581902772.pdf
    • https://m-astar.com/UserFiles/files/80870127966.pdf
    • https://kuzeyilac.com/resimler/files/wesol.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/5549542075.pdf
    • https://rajatotogroup2.com/contents/files/78205935346.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b52b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 16792 bytes
font_01_sfnt_off0000cd42.bin
6833eb0f70b875f8b09fb685edfbd98c9acc9cc9d84624d317d20f44911189fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 10748 bytes
font_02_sfnt_off0000e5f9.bin
377cba21d00245789fac3e2534347040166b527c80c41bfe27a0700e3cf9e42a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 15212 bytes