Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c4be190280a312…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 10:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97a367657a3d8579150da4fd69689364 SHA-1: 7bbbd0f1a008dca85bad4b240f8c08cf6f6d1bf6 SHA-256: a8c4be190280a312e25dfe2365595ecd089990ac17121238dc830d4eb2488083
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains heuristics indicating it is a link farm and a lure for browser extension or update installation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of a 'download button' lure and multiple external URLs, some pointing to compromised CMS uploads, indicates a social engineering attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://alohasafaris.com/files/tuzude.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/mawetikofo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c320041f---sulomexaledokutovigip.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/61663698355.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210717220654.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xojunok.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/boreneg.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/tumiforapuwi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16093f992cd783---95482976041.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608248d023865---xanosodomejesikosuxawaxi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd87bb1321---pipadalexiguferorefof.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae1d91255---fazusaxejatevepamaji.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/79720124966.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/63365717734.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/muluvonekelibok.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/redozavonevutod.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/47606680541.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6v1or92mrtuqs1kjab3kqiee33/pimusivej.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/papibagepowixo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6b175f19ed2848aefc137345b82fd0e3/katumedoturudufujol.pdfIn PDF document text
    • http://yuha.be/_files/file/34589592549.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ffd7df3fcbd8c391fe448c7c7e215cb8/78646033812.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/81678540529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=safe+gallery+apk+free+downloadPDF 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_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 17836 bytes
SHA-256: d7a1ff3419c8ceb5267c126b7711b41df0232cb6aa084a33839dbde80f317163
font_01_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 10684 bytes
SHA-256: 3d9330fb1d257324be49b5cdd4789a9abdff6baf49a1a8ddad14e706985530d6

Open this report in the interactive analyzer, or submit your own file for analysis.