Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f29b5db25d68877…

MALICIOUS

PDF

99.1 KB Created: 2021-07-30 15:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3913e2daf2579dfa1fdec95efb64dffb SHA-1: 96c60536b920fc080be2603bba126eae1fcebefc SHA-256: 5f29b5db25d68877a4f9756c866003ddd4d51dc4047dd1af8d10eed4418d4e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to domains that appear to be used for hosting malicious content or are potentially compromised. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using link farms on disposable or compromised hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.cafeinca.com/img/public/contenido/file/89617865348.pdf In PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/vuzadu.pdfIn PDF document text
    • http://tulga.ru/editor/files/meforibiditafow.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb2dd9e8b---wiwufojisagukifozuwuna.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c786350f70---4919247570.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/46761772762.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/4838576873.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/dijiwobigojenoxeremowakum.pdfIn PDF document text
    • https://patc.fr/imagesfile/defesol.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zutizu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc10de4d1f0---voviposixutebidisixelime.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2ebd0819dd3a371097c265d218316bf6/17036468192.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76c45b5df07fdfe8784d76d971b6fcce/45250608922.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609787b476891---lefazozukegifi.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/49654046117.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5fb8b76939495441ad2e490a60d21b7e/55339968248.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b16d874277e2d6f2bf21378af31fad89/lolupoxobutimimux.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vimifadoxefivoxud.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/luxekeminipifivanimesab.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/potogexibi.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/tizajipuxuruwogovedeja.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0a46132ffcd94a86e598d366790e092f/tasawujifoxefe.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6918f88f534494e91d68cd135b4cbfcc/kuzepijetefigofifexaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=aba+pairing+data+sheetPDF 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_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 10624 bytes
SHA-256: ba108780b6495c009b16bc17865da5535ca72ffd2984f1247bf17d01c8bef0a7
font_01_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 17596 bytes
SHA-256: 9cc623e59760abfa0d66ca802e06cd6cd5d184ccb4f46fa36c88a32f387e9c00
font_02_sfnt_off000164ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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