Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e5f5600ce77d6f…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 04:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67ce56d424f1039a2cb980a5e90b8e7a SHA-1: 35fd3cd9a98b4e89fceed1a319acaeedc59f96c8 SHA-256: 41e5f5600ce77d6fef6ebb3e24fb97411c0387d2243619427a80fec4c0f33228
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests it's a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49b1badcaa---jawuviviwemata.pdf In PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/98266638908.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/vumezipubezomubilenef.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210705_A69B9BE42F4626D5.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/3881859273.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/329p3kvk9g7ij5fuoh9agiv3io/11594464303.pdfIn PDF document text
    • http://artospace.com/pics/file/xuvetig.pdfIn PDF document text
    • https://led7.ru/file/96816244042.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5eff838f2be974b4e2d32f61a07a2c0c/suwemun.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/02682c294f6efb9dafce6154d8a16281/28185283708.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706abb26d74---12782390866.pdfIn PDF document text
    • https://altbuket.ru/files/77659737835.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea39d0e42b---wisisuku.pdfIn PDF document text
    • http://cga82.com/admin/File/52836542946.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/6716720422.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jedejodusokubowolip.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ivg6rtpo2qm0eaa26iuhjppomu/31580352343.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2708e18a7e---lazebamebupomibisavor.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/11089761506.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/23ec9690fb5cd25bcc71fb62645e9fed/fifewu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a52669d5afe---rikifenolibevanimixo.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/42562586789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chapter+6+enlightenment+and+revolution+crossword+puzzle+answersPDF 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_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 17148 bytes
SHA-256: c53740a43082d8e3406542b2e0768f5aacca8c85f66ec113368b6895bb90891f
font_01_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 11472 bytes
SHA-256: 89ad757918f06bc5d02407b0abd59fa22542d49863666072c81381fc796ae9d6
font_02_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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