Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7cbf7a57efc1f5…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 04:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c862f8cbc4cf0f387fa2e85c4ff7ba4 SHA-1: c512819f771b77f04172498e3e493a6f9b9cd742 SHA-256: 7c7cbf7a57efc1f5d35228ca54e814efe7c58d523ac74ec201a1b2b871b41922
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and links within WordPress upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=stryker+440+hp+manual PDF link annotation
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iq23bg2q9hsvqecgq0rouqenre/79795949274.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fbd0b1bad---91655048661.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160780cebe6e41---ruwirelasoda.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/35811768180.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfdbe0d1ff---fopapetilini.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/18805895619.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/butagejixibisitosan.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611625114351a---9536152405.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/fukexogowuxexo.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/63730160463.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/23293957692.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dedce6dd114---gotoripulagafaxiku.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0nrsv5k6ku35i4k38bepkqjroj/88060880287.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kazutase.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161995917.pdfIn PDF document text
    • http://amandamaitland.com/images/file/ponuzodajogodu.pdfIn PDF document text
    • http://kaies.net/upfiles/file/doxozanudijebipugasi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084c613878e3---88421863655.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4229c22070703ef8e58656fe4b473c80/xigufujesivox.pdfIn PDF document text
    • https://ivanamihic.com//files/16094770575.pdfIn PDF document text
    • https://servauto.fr/img/user/file/jurofasolubeku.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ad0a7963---43945033860.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/14195047833.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1uamsg4c407o5p113npu25t3c3/kabogoraxajojupij.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1eed5a13---bonaxagewazikezabope.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_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 17792 bytes
SHA-256: 5986029cf397edfb749e66cd5a430a85092dc1886ef0c1fe23a68a084bfb6124
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10716 bytes
SHA-256: f07c1684e5f91295f4b5b087536137c18c98bcc0555e3352c738e9208e048729
font_02_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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