Malicious PDF — malware analysis report

Static analysis result for SHA-256 31807d7651da19e0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 22:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfeb30280f553aad733f524c469adeaa SHA-1: dd76dd4086c0a851ed454d7baf592dd4abb5aef7 SHA-256: 31807d7651da19e016a057b7908e9d30093c24f4aa8670abaaefbd61c97e7b42
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://share-world.tw/userfiles/file/bedogukigemegonuv.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c55891141---70431240574.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/lotukevenafotovag.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/41508592110.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/31462548744.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/napapegudaf.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/wofewojapejalos.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/82041887672.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/54184181177.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/79b17062cb15268d1827908af64131ce/99315573865.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/82250339148.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/bifegubo.pdfIn PDF document text
    • http://kite-surf.sk/files/99448950149.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16134dac9af8c0---97143012923.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/tovevoka.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/xiweg.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/23390718726.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/delumoxaxuzagizek.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/jakopi.pdfIn PDF document text
    • http://4rrecycle.com/files/file/59077055730.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e3344f64---tepenikoberowisok.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pesafetisomozajozubifenap.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921d6bd774---bapasekijezofute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fake+gps+joystick+%26+routes+go+apkPDF link annotation
    • https://lapdonline.org/file/babikilubuvifufexinelox.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_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 20880 bytes
SHA-256: c2888b7f235519c4ecc8ffe37efe793007ec54f45db508aaaa9cf588b5568c27
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 10612 bytes
SHA-256: 9b32fa8d0b60488de32c27b449ddb567a9a9ac4fde8ab0c0afdce8ddd661c267
font_02_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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