Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f9606bb0bf6064…

MALICIOUS

PDF

110.3 KB Created: 2021-08-01 14:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75e0de55fe9a6614a0182afa261e5b26 SHA-1: e0a9754719fb037d4fbbb51a63fef9902a6f641f SHA-256: 25f9606bb0bf606481f8ee136673d4e0d906e00c585d8e3711440765add98e9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://catamma.ru/uplcv?utm_term=english+cream+mini+dachshund+puppies+for+sale+near+me PDF link annotation
    • http://toptoptraining.ru/img/upload/file/23436567189.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3e60fa72---72733593569.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/66293616206.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5b2219e25fda9d826ad14889d17ae306/93786248816.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfca31138a---nijunevom.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0c28322a---90583230411.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210726115854.pdfIn PDF document text
    • http://mobitransjogja.com/files/sixufobirerekodizep.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8l8dgqv523v2ra7327fuf33svp/17262834442.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/gogaxobewuxun.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e6nap7gjgbsf49mvrdsb0a3ru4/bagazolevi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0b1a3bf21e53eb03579334fc1f16e79f/26830134047.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/bexupojiboganenubajabuv.pdfIn PDF document text
    • http://nessium.net/userfiles/file/77732132150.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/wowokokotenusujovi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f79746042552282e81a4634e8c1e22ed/5281255832.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078233193f73---48138882802.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/ravalupexetoveliji.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3flahpkmuhl3inqtiip4rccbfr/zoxumokalabovulajeg.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/penotadekiwa.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/66841900402.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a704e9f9---9934811554.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4577ea2ce---16327239288.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/fovimatimimogelumixuraxak.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gixigivobo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 16680 bytes
SHA-256: 3a7ba6b06d81bb2f2fa5e8041be7a32a661b1631bd5457e9ff3fd2e16c0435d5
font_01_sfnt_off00014745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14745 18680 bytes
SHA-256: de28c1d5ce31acbe8c62d19cf1dff4ddf6f2dfd5e360586c53319cb37770a0da
font_02_sfnt_off000178a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000190bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190BF 11052 bytes
SHA-256: c215e7ca1992cbe0121b1a0eec0826f29defe1c23397bd96004d5a48338d205a

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