Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a019b6331fb35b6…

MALICIOUS

PDF

109.7 KB Created: 2021-06-28 22:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3d70b9f524c05c9346632a44fa146132 SHA-1: 24a2c8588993312bd2bc2021135038017097a4be SHA-256: 7a019b6331fb35b62dedf8dd6514628124e04c01f1190212a391417f8d60fb29
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage these for hosting or distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1bfabe9a---zuxikeson.pdf In PDF document text
    • http://18554080.com/userfiles/file/gugopekudowo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094013813a9e---88438860136.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bcb86f86cf8612315f2bb3fe86fc6827/bejufalezamogolij.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/buxelejerexemezo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/12592541284.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/zolojawumaxawiz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a6d018b333996cf67da3a2fa6f9fe067/28856179938.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u1cleft6qnblaaaec4342in6n7/bakumafixizesusukidef.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/704ikkg9sq7sj8stb8nag8vfl5/22527507600.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/120e18d61e01db104501d2128149158d/80040684660.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/89333148266.pdfIn PDF document text
    • http://www.siposferenc.hu/html/74068282619.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/gavanavovudafetamuzozu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc12ebe470---dolusedawetafumezaxu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8e17e793---10078262647.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c1f81e443cc89f41ea23f2e8507bd748/88742302844.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf625e81d2---zefatotamelebol.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b59cba56f87---nurevidawosigifederuru.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86b460391---zewevijuga.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0ef0f903befdf34ee3f12ab8a132227a/26965201524.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b92654ebd---zixaxagojotokek.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a133dc96d---60749696737.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/xajeputolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=logical+maths+puzzles+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001479f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479F 18044 bytes
SHA-256: 2dbbaf14cbb57d20ff033f3e4dff8e5be506a4ab54c52112345472c4164eb6bb
font_02_sfnt_off0001774e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774E 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00018d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D5A 11024 bytes
SHA-256: d44135304880f4f78c9f2b47018e5819c1c4d4243109d8f29ef76d715c2c97b8

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