Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d2e9218dbc50b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 09:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba394889fa24747396132c1647844250 SHA-1: 486d9552260a4b8f752b903d2589d22007ddfc50 SHA-256: 3f2d2e9218dbc50bcf71300574416a638ec756927c9d90cc8c46a56b218e760d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by multiple heuristics and a ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of a link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://palirna-frydek.cz/uploaded/file/77820306409.pdf In PDF document text
    • http://cmtoolsrental.com/user_img/files/88086687318.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613838c8efe61---kugavopojidabovolabeneliw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7f3e427daa357200e5fcdfedc9088a2/29221058585.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7494038d05039d83e79efdbc575aec88/72001919133.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/28765435487.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/02cf05feee4a571fe6d418bc3768ab86/komikeruzokowuxani.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/67828121297.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58650710287.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_7F31268BCB263C9C.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/58159692836.pdfIn PDF document text
    • https://swiz.eu/files/editor/jokadagunojojogukovu.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/67858357744.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rapoxawataxaxuton.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/ziwodos.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/suninosibebiveb.pdfIn PDF document text
    • http://caramelitos.sk/files/mimoviguxabatolituv.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db8c37eff---8558138813.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/58888131775.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/34509280983.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/pigulejibejumadexuzop.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///61521227106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+print+screen+on+android+cell+phonePDF 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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 10688 bytes
SHA-256: eee64d672925d1a58736f1a2d3206db1edeac208b0dbb938f6436cecd6786bee
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 17452 bytes
SHA-256: d07c78e91bf5f1b823a0a0f339eb56e275783a09cc4f804fe2e39f05e894b256
font_02_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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