Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a352b520a3e6a6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 18:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 918b85cc08889a02582fab3987ec2020 SHA-1: 513e84aa103b8697f423e8a52c3b1bc3e276ffe3 SHA-256: 65a352b520a3e6a6a3d49c16377d17da8500d5bedf25f39a693c3d3c09c0733e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a phishing attack or a downloader for further malicious 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://nomylo.ru/uplcv?utm_term=probability+statistics+and+random+processes+for+electrical+engineering+3rd+solution PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c59d91636---75629488925.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/wibujufi.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/bofefatunatapumav.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20084c0b8---30104969920.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/kedodudegezolomanexon.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ludude.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/16004125878.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/69724824832.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/limaberabu.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/bokajoxugoligibevanosize.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/32317231298.pdfIn PDF document text
    • http://jucal.es/images/file/mulukafumemalov.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/97944873543.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/38092017675.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/82722202774.pdfIn PDF document text
    • https://phnews.ro/files/file/21126087393.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4ed41032ff1d27d941a2602cb1035e70/30903600781.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/44865177408.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/idigs24622bj4cu7ascb8t1iaq/povejewori.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/55998880273.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/86632265246.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wekapitiwelotegani.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/judejovi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/95072098706.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wekegafuropozowezexopakug.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 11492 bytes
SHA-256: a5133474b64da94b8a34814aded78f26b4b78687f2bcdeff95c75997e5bc827e
font_02_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 17232 bytes
SHA-256: 4fa3722cc9d42a837886bb5baedf40723e0b22caed4d0fc44e9694fe3dc51188

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