Malicious PDF — malware analysis report

Static analysis result for SHA-256 167cff5bcb3b49cd…

MALICIOUS

PDF

103.5 KB Created: 2021-07-04 05:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa8e6462ab0b24efca4eafa8f372f72c SHA-1: 2e7394a2015fd9b55a77790abda1678410ddf4ef SHA-256: 167cff5bcb3b49cd91bd38c4a1f7605f18d6daa13ad185cbb72d266d9848a0d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=raintree+english+course+book+class+8+answers PDF link annotation
    • http://kayamedbursa.com/userfiles/file/50062863241.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/ledojejugubebubogad.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/23329128779.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/40d88ad27459fef9539c89c84b580414/xanegazepozaradojuvosunij.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/28529713494.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2bbdb4c4ca3a7ae21de647f465f07d38/xivakaxorazel.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d9d77d4d95c86afc295c0b5ae46207f2/31770517464.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608381fc788d0---52281826757.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2b16tdkin6kqt7q5hdvnhuq1mu/7626057583.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/gozuvobesuduv.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098d252e241f---pavanixanoxoguresutamipaf.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e80cfb0a683301c7ad674bd46eda53e2/30267109123.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e5771591---55409254437.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/toranatotukisuzazawakuwim.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56690583437.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/levuvidefuzosogoge.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088701096cbf---19947544930.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mowaputasipirovitaxij.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607824e691697---madulixesus.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a193f93bdb4---35822943379.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/segegeba.pdfIn PDF document text
    • 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_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 11180 bytes
SHA-256: 332b9ad9841afc6144b7b296fc2633571c1261d5ec1838cd71660698f3f7f81f
font_02_sfnt_off00015f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F07 18976 bytes
SHA-256: 9a4585cae02db4d3fee8ac2b8c871ca24f58eaaee699028686ee073abd49f762

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