Malicious PDF — malware analysis report

Static analysis result for SHA-256 c091901967e5bbac…

MALICIOUS

PDF

136.0 KB Created: 2021-06-29 00:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 917ff7418a2ae0c5142d63b8d5b4c706 SHA-1: 8b8fb0fd8a89131a91365acf651eca19a5b548b2 SHA-256: c091901967e5bbacfcbad299d52b27dd7630cc4a7ac1e6fee479b7718a2ccf5c
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the presence of external links and the high ML score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=mars+rover+findings PDF link annotation
    • http://busankid.com/webfiles/board/file///ponemubobanulexaluvoziwu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1d9vh8be5556rf86g9g6tbd5h2/jipebugisike.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900addc71d4---wabofesatuxokemitidafamex.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/30e73a02287ef909358de3465ade073d/gosijobuzisafibagewekuvi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a2e402a691822f71ccc0105514e42c98/35419110689.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202167121529521.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vgbcvgvckqli94jj35b2k36hd2/84592220336.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079a24c28a4b---65976718674.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b9a57388cf556443d708978efdf9b31/libelana.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a172fe2d---49599252126.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/67240195104.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7bde697c932b4814895cc8ed4de78969/torufodifaxopubi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/fb7684b84f83751a4f3384258712440a/rupozazotok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b033f0e8---76207311717.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/61923489204.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8d2b4cc538af71ec84f068bb2dbe18c6/49793715006.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/tokadilip.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210622_FB2490158DFFE1A2.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f6633465---relujemuboka.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/70768345658.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5hsuh7jk5mjpla033jd2886a82/50674199669.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/52128423898.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj5b9iva917jtaidrnh08dvba0/34584577164.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_off0001b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C838 10444 bytes
SHA-256: 80fcf318fb8f0e07fa8cff2b8fe9e0a47b2d6b64bee7e4a82fc01676b9be4cf8
font_02_sfnt_off0001dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFCD 19260 bytes
SHA-256: 729206138b274be86401e265efff382cd5ddfd5b13f4b9f0bed23680fd83d87f

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