Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b046587caab5ee…

MALICIOUS

PDF

97.4 KB Created: 2021-09-03 03:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f484ee9387f74df72b4bca3163755945 SHA-1: ba556083ba6bbd30b3288ee7fc52e756ffa9601e SHA-256: f4b046587caab5ee5e9ee4b4e902b3e3a70741febab21aa6ca80a172381c0d26
172 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting it is designed to host and distribute further malicious content. The presence of a visual download button lure reinforces the intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/81407ca9dba56f87d661b2cceeb870d8/39477534766.pdf In PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/26967947139.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/ramewowowironuzugotemogu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/49c4817cf1e1810bc0f09cf9a3db9bf0/kutisogobelenidomupa.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/23390660195.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4f001337d1c94984cca95c59d415db76/bagozobe.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/54466294382.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607156ee60a1e---11534324384.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/morek.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b5122837---83764816460.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/375f5e8a0082e9cb0ff67a0fec63becf/74475742401.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jtm8u9jm4o8fqfi31unc9sdlhb/bewotodatusamupuru.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2272cdf15f---25535268817.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vjori1m3bnm7h1h24032ccesls/32491499617.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249268a864---29743335297.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/1090790311.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7pjnlgsacb2kiil3ba2g4sffh5/dunepurowepirolagovamakoz.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/25773070916.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/11532066449.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/38961913640.pdfIn PDF document text
    • http://fittbike.hu/files/file/54360420658.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc31a4c9b7---23602413218.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/53317772838.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/63143182260.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kiwosixomusaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=simatic+s7+200+manualPDF 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_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 18804 bytes
SHA-256: e523750a8c78407524099ae5a08d975f47196d86caddead876886098ad896e58
font_02_sfnt_off00015ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED1 10504 bytes
SHA-256: 77ec36bc2a9a9ef6c6268aece4cd2c12cddd9abd1a35645c1d05e0f0e33355db

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