Malicious PDF — malware analysis report

Static analysis result for SHA-256 305172c209af0014…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 17:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5c7e6058bbd77cdc37006ff49ad5522 SHA-1: 4c41acd0beb3fae2d0200c4829689e23081d6266 SHA-256: 305172c209af00140841c7111794737e3f1a299fb7daaabff8c23b507212a36c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=hp+pavilion+15-cx0056wm+manual
    • https://saikekanglun.com/filespath/files/20210824071539.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4bda41bfe---73594928895.pdf
    • https://washlounge.in/ckfinder/userfiles/files/jowebosugowajix.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/45606888457.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadb4d883d---vapiduter.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc78981b49---pazaladezumudoroma.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a7345d11---vepuguzora.pdf
    • http://szao-spb.ru/images/news/file/sipokapajek.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160707cfb3d86d---xifelejopejigadir.pdf
    • http://sage-chem.com/image/files/20210710_121647.pdf
    • https://venusnvs.com/userfiles/file/femovabawuzu.pdf
    • http://singer-island-condos.com/userfiles/files/49827300219.pdf
    • http://guides2alpes.fr/uploads/file/nomufanojavetezolubip.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/gomedaw.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7d297745---72453414458.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c78b03caa---1798455850.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca02e2c9f8---fegumodujonekesoradedoj.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e101f131f0---bogasose.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/90554596238.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7ac9d0659aa393faae248bb7dda95b44/72088168420.pdf
    • http://askaudit.ru/price/gusokojojanosomozopago.pdf
    • http://arenabilardo.com/data/_files/71273115924.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a1.bin
a2b74544c11794544102cd56e01722d2d74c83000a4c36690448e140fc9322a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 18120 bytes
font_01_sfnt_off000105f1.bin
2e78837b51c73c45e1cdce071870befc9c78a2b63cb4b086abe8bda7a6698e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 10892 bytes
font_02_sfnt_off00011f33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes