Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb7a69f31a5b25b…

MALICIOUS

PDF

93.4 KB Created: 2021-08-20 14:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12639e654f5d89c4547cec4bcb24b523 SHA-1: 3b3594fb5eb94a24657654cae99caf8f7a641c86 SHA-256: dfb7a69f31a5b25ba9846b2397b3eb41fc2f5d8f31e8b68bb15c09bd651694fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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://anhuishangbiao.com/upload_fck/file/2021-6-30/20210630185337105697.pdf In PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f4563c6ae64436f0087edb54ea68dcee/wonaxuvasox.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ca80e1f8c---vudebazuso.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af61974176e---2247982971.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/18f0a9fbba2b8b457e3e2b68566d020b/zesupa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/56490889154.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/58502182559.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b41a44c7ac1---65545586140.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a8ddb3578e5ba4db017cd5f2cc1813f5/95175354496.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d382111dd---33439366706.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/07e42ded7c15b0a11c8f7673a669dcd8/buwotegazurepiduva.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b37e400e986---zidupajabexivano.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa307d55d---20464765911.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/81774194199.pdfIn PDF document text
    • http://kotolantopeni.cz/file/ziwabijikimagebavupite.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/98787145669.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c8488395---29830590822.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fko7bhi173hfbo65h6ua3nnp9t/15276751851.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160772d596c7fa---lufexoravufijomefamifudux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1311b849---82086178295.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/38858768199.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/91849316669.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/79641053252.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/21631800468.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/16017959653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+ambiguity+in+nlpPDF 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_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 17024 bytes
SHA-256: 583189e172715807569dc1bc9d0c1488f22a27c215994f381941740875819a60
font_01_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBA 10696 bytes
SHA-256: 1a4f9f88e88560961ae73117ef1b4ef533e1c533ba365879be518019c2d603d1

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