Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d888ba85b50955…

MALICIOUS

PDF

89.7 KB Created: 2021-07-31 20:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d58f3e936e8c1604530333c5a5ed9f1d SHA-1: 718f98d36444e1995d1ff064011ea1cc55b07921 SHA-256: a4d888ba85b50955c9b5906d76d4035b1655ba4795ec3d6be113517600c42eec
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade initial security scans. The embedded JavaScript is likely used to facilitate the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qckf0g1runkeg3arnrfh4kgqe0/zalenogegu.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/62050f2bfc535ce864b48a97c570acad/21180094306.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce095817511---kumenaxirod.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/40294552089.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7369998cc9---vowasudelinusajabovapo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/dizuve.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/09c6172e4cb26c9021f5b6fdb27829ac/valiwilaxot.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06e801e5e---wusasajunijotuve.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae33f0c7---kavelaboretesujejesono.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f3257b38---xukinuke.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/60546204389.pdfIn PDF document text
    • http://dgjst.com/upfile/file/40186726920.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/linevow.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5b24f0b4---waluresojawelila.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c4e31216---30669997722.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936017c2650---33500072351.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963cfb69d01---98496988988.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f289b3b35---37063973000.pdfIn PDF document text
    • https://mauspro.net/upload/files/44611257803.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/rufolapagidefopututanosa.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/jhu3cgk9t2o51916f0l2tks382/18110982611.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/rolakusejonudameturupo.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/wufumosubokuzojoluzoj.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bf07e4a66aea9b24fddeca607e6ddf0a/4677682396.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///39763239963.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/26139523852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cade+simu+3.0+portugues+download+baixakiPDF 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_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 18552 bytes
SHA-256: 4fb799d18e47e4f5e6eb0559f88804c353ca45ef67cdfe7db8dca4143e7501a1
font_02_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 11648 bytes
SHA-256: e8e4f721a1e0a065501fe0b744e4be02b72c396f0a083ac1af0a95e5237b8ac1

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