Malicious PDF — malware analysis report

Static analysis result for SHA-256 d834583450b85fd7…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 16:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92c9987b35a0faed52b295b4ca397429 SHA-1: d8dea3ffb9d4f1904dfc42814aa4a16d67678ef1 SHA-256: d834583450b85fd720eebe3353dc6983819a7e449597ff2da9911d2ebfa78538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains a malicious payload. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting. This suggests an attempt to manipulate search engine results or distribute malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://richmore.kr/uploadfile/fckeditor/file/wepanadetavo.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/623cfb27c3dd63095657aa7a30be0607/purubaduxexofadojenak.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/20429985759.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088473077628---72203283450.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd696fddb---65375977110.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d435ef8cb---pajopatanijunonovudep.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0eeb53f2630429784324892e89091ecc/933606162.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/68683210737.pdfIn PDF document text
    • http://merwepizza.com/upload/file/6204660845.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/10321055704.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/didikuzokenilafof.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/milemekixudarigi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1490c1d8---benudinadusedezavigiwa.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/58613241802.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a25f06ebc654fde17989763fede8d802/welawuwokizolotalam.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/dd9531050923f21fbfdafa1e87850c20/vukibegudoma.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/tupazugatizoz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5k774n808ear7ji4utb2bc162q/20599141780.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16132d71e19e2c---fipotap.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ba5174a3a91c4681a1e2241d8036254/87378884036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=macchina+da+cucire+manuale+mediashoppingPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf154db4d---xulojunumerafifop.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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10956 bytes
SHA-256: 40bbc0ff066a88c2aac1e49a50809695681ceaab985244cfd4bfd36965493c93
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 17540 bytes
SHA-256: 23497785a161f8b59c767a0d93345f8e70f9ce01e6abb3217bf0304f83fdcd33

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