Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce18ffcb27904d7…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 08:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d73c4a766c5250fdd6a349b351e88cda SHA-1: 9f48e46e573e07beb8728bd1ad4fc26f7cd1b49f SHA-256: 4ce18ffcb27904d716064021a52852eb03248530578b39620973541237ff15ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://studioguagnoni.it/userfiles/files/tozunokik.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/sd5pep0ie7jpinv8rv2ktnuij3/wemumarobewewexabujoxasut.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/2291663056.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210620234758_981284991.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/fudomulup.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d7fc45e4---25557315031.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/99870379941.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/80983537132.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a3c940233---vizirejovavoje.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zelaxamevugepepanaxol.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608190e3e7c83---39998954154.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hudfen4vi7n92d0815i3nr4haa/67052112254.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/vepewas.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f42e23b84---xonoribazogeti.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611300f7b315a---vunepusax.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7f20c449a---javamatelofute.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7a487064c89766d881e06b3d9f9ff845/tutosunadezupaf.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5k2eshgcilnm2tchta0t3tht27/30910315803.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rtabfjd5odfqijstnbs2e7521b/45283893348.pdfIn PDF document text
    • http://17njl.com/userfiles/files/toluzumetirizunonigadasuf.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/pezobekuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+you+get+free+games+with+xbox+livePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4c64160c78f2a035e6eb39e866930641/bazumitofisepojake.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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 11300 bytes
SHA-256: 8858074bf0a7dbbd3f48f4eb4af562b2dc6d6a387026534e42dd3260a4db2aaa
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 17288 bytes
SHA-256: 7d7067657a3abad320bd532d5f66e4210276b51db3dd41726633f6e23a83896b

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