Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fead2f0077ae2ee…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 03:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb3ec915684ac3aa2e0d3f680a1db156 SHA-1: cb708ab96533f44c8cfb4d94feb259c34cad8711 SHA-256: 0fead2f0077ae2eea18c7c39d6b11a8661862339b9878c6557ce0021cc05d9ae
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36440c6ec---49068626583.pdf In PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/26333965895.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac7eb7f41e63b3869d9ddf05bd1c94aa/ruduzokanow.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/95870030283.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/sofafegibufegas.pdfIn PDF document text
    • https://kristinanamaste.eu/files/99240547989.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607556bcd0c2f---kaloturigapidenizawurap.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/witibuzigebozazekuzuk.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/71743995332.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/16f5a43f2e268778ea8b74f5cdee323d/futamifokuwilelotiriwa.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbee4aa58---5750478301.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062808124770554.pdfIn PDF document text
    • http://gloria-eurex.com/41985277104.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/pupurixore.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/favovopeporakojodiwubefu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855a7a49da5---fitavuwu.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/24/49999668933.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e532cabe---49301121226.pdfIn PDF document text
    • http://nensi.si/upload/file/74321000517.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160914b693d8ec---votofuni.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673fdbf356---72585405748.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8ab7d4c3---sujupanoraku.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/xulumidew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=7+letter+word+4th+letter+bPDF link annotation
    • 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_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10076 bytes
SHA-256: c7a4c605a8cec72d91bd23bb5a0a43483befd2605ef46225b425bfd8d189fbf9
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 18072 bytes
SHA-256: 7dd9e2f949f9e71e012029fb572212d446a26458f359a2e05cdea66b65594547

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