Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe536d7ea679b5d7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 07:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68a6f4bf14ab418874360faeed35627b SHA-1: 413aca47ef37c26072cd61c972b21b20ab3bf057 SHA-256: fe536d7ea679b5d78de37fb36cbd89cb18b4ad7a3ba186b9ea212e8adee41112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as containing a link farm and was classified as malicious by an ML model and ClamAV. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the malicious classification indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=experiment+zombie+mod+apk PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9b84ea9c01d8910ecac46f723d06872e/bavare.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/74754853365.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/paxevuk.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/gedujomapo.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/51963927720.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613db98d9c1bc---lolakabadijapudaxig.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/6926730.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/76533955076.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/52543575361.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/90090146783.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/9314483294.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/9284244795.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/kajazos.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jefejix.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210909065444.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/69679872819.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/bimof.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/finajokax.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/65581995589.pdfIn PDF document text
    • http://gestioniarmatoriali.it/mareleka.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/46029707607.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6ce8f378eadd7d0715a699afe0f9d82c/51439992149.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_off0000adc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC6 10716 bytes
SHA-256: 0d1ca7d001a54123d4ee99a685e80c2c6e43f9a4221ef8278dde3a9d5b4ebb4e
font_01_sfnt_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16104 bytes
SHA-256: 2edf3e60d47e9f57b25f739e639615161b850e3793c9d6b95a22f396aadcb9fb