Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e72839e12e81bf…

MALICIOUS

PDF

71.0 KB Created: 2021-08-29 15:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91fcca4ee81b8ebbabb6ebb30f9b9646 SHA-1: 51e5006a688fafc8a44cadea315c86eafe470a79 SHA-256: f7e72839e12e81bf20a7e76156ebd01889fb6caee0237af10683a41bd6b8a873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the presence of numerous external URIs and link farms hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing a secondary payload. No scripts were extracted, but the structure points towards a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=labrottie+puppies+for+adoption PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe6356289---lujifipirogenubokabirag.pdfIn PDF document text
    • http://c-amc.com/upload/files/tebofuwosawugivu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kafqmfb7271ot8gocu8t9t111q/33770816451.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/lavokegefetadofid.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bfc6tgjl806gsp6d5h026t2la7/nisilufu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851ea69921---sowijobufa.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/16098572662.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/68383790044.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/28027578336.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/xevokowuwimutalar.pdfIn PDF document text
    • http://honghuibio.com/d/files/9440210410.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/xosajefe.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/174324546.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/patuvuzi.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/58581517775.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff26f64387e---nagarumok.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753189845f9---99106295609.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/57447420377.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/m9an8pcem5bm746b58mii2qr3u/getamodo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608077d8338e8---31443387752.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/55670595e5c06f557943fb0aa8255746/7570946450.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25dbbff39---mosotobaf.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a0es0gll1vsvlbb7a9a8qe7hd2/tobesizagifiwogapulaneve.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/gosegomuxifigeveseg.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_off0000b861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 10644 bytes
SHA-256: afa3b502684da961771b182daa8ee6f4e15bc5a257c49a231e72a048e083500b
font_02_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 14892 bytes
SHA-256: dfa77cfbab3bb2c5cda1ea2be47f47305d9b18e8cb6abebb09545690cdb07ad9

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