Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fef496c4820e843…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 09:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f129e9b7cc513a224380490f4b9b2c8 SHA-1: 4c55a3009769c3bf36c595ca452f30da86ced917 SHA-256: 4fef496c4820e84367951fa918b6e6030343ee9ffd9183d3e43898aa1b21266b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript could be used to further obfuscate the redirection or initiate a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a8496c32026---42574054236.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/81612399437.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/zosotej.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/watanab.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/lebusazakatimu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/botujuxikesefesiwopitote.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/60176046561.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/sudipijoguvuxile.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pedepikilorixobitewevedel.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/99124507574.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/407645ff1ff3db2cc19de69a190c532c/15372703606.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084b3ea215---74928349990.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/54620590487.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/15997473281.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/80875269295.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/cfda1bb7bb7a223c985066d87e44ae78/80266173683.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/wiluro.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/77700140745.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/vepakizopipanikajofatat.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9b61c770053696a1e9c942ae39e6aa18/74815599283.pdfIn PDF document text
    • http://cpils.com/userfiles/file/82284740490.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gab5jhingc3je5p2rk1053m1ij/japuwibev.pdfIn PDF document text
    • https://menu2uplus.com/images/file/51229592667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=example+for+a+biodegradable+polymer+isPDF 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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16872 bytes
SHA-256: 45c07460ac3cd7ab7c38ea8faa26345b31ac90c43238fe3e87ce735358ef4cdc
font_01_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10980 bytes
SHA-256: 30aedf8dd89c68595e35ab6fca3a99ed76f1daae9b287d664eb9c140b38fc485
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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