Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1f0ee53a558e23…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 01:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3eab44776a50154cbce5bc6ad33f9305 SHA-1: 39e3b45d651e4bc865bbbf6632e24a63bb492261 SHA-256: fe1f0ee53a558e23b1d50266bab1bcbcdead8079ba4900335c3717e597205433
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://zebcom.in/userfiles/file/63689872272.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/14091249050.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pijamuzetaf.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/vimidi.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/79418118408.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f97fefb71---36268422990.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/83271839872.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/kirezuwetan.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/jebelafapibikuloginunopu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/710d97b920bcaac55ac43360f18915e5/39523246411.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/betosup.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/94455638048.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcb80ee2b---gaxata.pdfIn PDF document text
    • https://x-software.cz/data/file/bapugukisavuvu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8e32723a4c3aea98641c10e0cbc8273c/roroketanogowilafa.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/weguriduwatov.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gezigofarubizatopajaxi.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/11076282271.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/39761415182.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60ce01a71f---10108984265.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f419621d---tugagakarazimes.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/mumeteravonoxixokirewud.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/16500483058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=reading+pictographs+and+bar+graphs+worksheetsPDF 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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 11108 bytes
SHA-256: b2f7ddab2efe4e9382a289242b27460bee8e526e2d886c030356bee14961ab00
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 17348 bytes
SHA-256: 2e2c3b7e6ee85d28a88829736d3bd450d8dfdfa2c20071c6bcf196d672349a42

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