Malicious PDF — malware analysis report

Static analysis result for SHA-256 459fbf6a06838561…

MALICIOUS

PDF

74.7 KB Created: 2021-08-28 08:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d1a922688daea15d7fc71c26ac1f0aa SHA-1: fa86dfc3b6fa4b59460968ac581cb144bbe203a8 SHA-256: 459fbf6a06838561d1a9854be0c28d59a4240c1fa7100363657a6f011d55fb40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738511e667e---nadanigipurevi.pdf In PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/60073756073.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/1905328007.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/lidugulinimokofavimipadu.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/24469807090.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/9597120468.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/39430227774.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c80380837---56711905879.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/nepawi.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/22788067540.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114d21f70f1a---35976481804.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/4235673105.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae21cded9a---87341817220.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/84219557018.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/66330507856.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb11ac5086---delivuzenenaxefazekeg.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/mapiwatamowutatuzid.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e8486f48c99.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/46841858699.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc0037c95---33775733917.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5d1k4h0el9v9det8ok2p5fu5m4/labulanijevekesaguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=atomic+radius+questions+and+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 15920 bytes
SHA-256: 777917d25333ed362f8825ed6004e0cfb96a4827a7a482e293ca5b3a90fd4665
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10796 bytes
SHA-256: f4bd60e860869685d18ccb97efc802a63357c281734bdf1bead51e84ab142527
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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