Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ff2cdf95cfc62d…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 10:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bf642231f91b3e719b089ccefd3e6e5 SHA-1: 43546e49626a537547b7c5890a55312676c8c94e SHA-256: 15ff2cdf95cfc62db6ceb58b7d8d576c6fecfc8f0e7e5aeda0da12ab0efc3c50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as an advance-fee scam, containing language related to lotteries, prizes, and parcel delivery requirements. It also functions as a link farm, directing users to numerous potentially compromised WordPress sites hosting similar PDF files. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608223e107ec1---58424277041.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b169ac9c233b394020ed48e718476c11/fuduxiwaxox.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/kilefuboxa.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5640cf167e2f65434e71eca3b7773f66/66706289981.pdf
    • http://accronline.com/userfiles/file/kawavizewumilokevuke.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a984a22fc---xutosodotizawatiki.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe84d5342---nakoravitanivifowowizu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/eu4uo8h9ovdulao26f9iiud4ig/xinalepisazudobijek.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762230afdf1---10129846972.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d562112468---vufexabexebu.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8cfc60c5bf95a3e9ed165e78984658ef/zagiw.pdf
    • https://a2designbg.com/userfiles/file/80151254864.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8811c44fedde60c5f7428f55b9274a37/riroz.pdf
    • https://contabil-fiscal.ro/mm/file/sikirurubagegilopamut.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2a1242e0ff5df2e1830d85405fc6da91/gobazixa.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe7f1cfcc---48404308438.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/favajog.pdf
    • https://astdubai.co/userfiles/files/weduj.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088329906781---xukuzewobosikifuguk.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c831b0822d---lozirarejexakifivot.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071323bcedcd---xadibu.pdf
    • http://charivne.info/images/file/69648889948.pdf
    • https://farstaslottsvik.nu/anvandarbilder/153/files/wisarokowobi.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769102254f4---vetudogetumitalagu.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511192911743564.pdf
    • http://pinxedien.net/upload/files/34945180215.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nestlings+gynaecology+and+fertility+centre
    • 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_off0000e9e9.bin
538a1157b2f2014371fe819bb07aa9d428ca8f5049486efd74e716e4793ea103
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 17264 bytes
font_01_sfnt_off00011739.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 16792 bytes
font_02_sfnt_off00012f50.bin
1d851117bce4923ef359019245e66b5860641f6592c061d89f6f6a77a83e81fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 10740 bytes