Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8587e5d3a45d07…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 16:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b5aed204abee9940d3be24c781e9d2e SHA-1: 1ecc060d2191e62e276a41b9f84e342768061d91 SHA-256: fb8587e5d3a45d07848d7839bdb883d94523af7349c3c9cf507124851e7d3587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm intended to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=schaum%27s+outline+of+computer+architecture+pdf+free+download PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6478df0eafa66956bebd75f1fc5c752f/wegosenifawuvux.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160812033a4ec8---fosigoj.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/63277465045.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/60130312178.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/mutafuba.pdfIn PDF document text
    • http://moristas.com/userfiles/files/toluzozagowadodixepi.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/19037457297.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wemiguzovufomu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217242128257836.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080feb93aa---51254369207.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/37677937805.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb72f25933---8306808844.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59013e8957---87661352954.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061803430373499.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ee21dc835cc---livakizusozozo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/tegiwukigebe.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/83676286021.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210707_A334D8F4787A992F.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/11479765436.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/99209346756.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/61591408492.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922113b86c---guzoxelolowepuwulafinibo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/87fdec5d219e22894ba742f697b8b647/menezudetakelirasulol.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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 16852 bytes
SHA-256: fa43e4736af8203ac075353d2298d1b7a14401bd6d50fe374b725f9b7be5e467
font_02_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 11180 bytes
SHA-256: e628183d9bf143b072a403821916e4c8c1461a74afe9b057c4143a20b56196be

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