Malicious PDF — malware analysis report

Static analysis result for SHA-256 47217ad1ff1ace71…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 19:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a2cd37442ffc9f7bdd87b7adab6c5be SHA-1: 2e0d23407a1d29074a3c197c67873cc69ed451a8 SHA-256: 47217ad1ff1ace715f15abd395f66dc36287c8879e4183bdf88428ecdd303b8f
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, and contains heuristics indicating it is a browser extension installation lure. It also functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=vocabulary+for+the+college+bound+student+answer+key+pdf PDF link annotation
    • http://maivietnamesecotati.com/uploads/files/zitugule.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/23425371292.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d3b2aabeb5b82769bf7973fa1d738c3b/65966927861.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/soredugipemobasaf.pdfIn PDF document text
    • https://www.naturartshop.com//ckfinder/userfiles/files/39942909061.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa52eedc6---dunuzitafe.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/6508519073.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d990a88dc5---95236143974.pdfIn PDF document text
    • http://esejsc.com/upload/files/vetupefegozegoje.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b81efb05---jebuj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074805a9ca1e---28222307019.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/94250789309.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/30694219255.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0697e222---46779414353.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/72d8956a31f9e354cf0ed8bbd0bbf924/5931549202.pdfIn PDF document text
    • http://altinay-law.com/images/file/48447824662.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada873f36d---pifemoboturemusewotekuvak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3de9e8830---dubavopi.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/30366753341.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160714e5b410a7---renakuvavitavokifixibo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7b313d6acb5818f6ac1fc987b3932268/56316016489.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/43494336338.pdfIn PDF document text
    • 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_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 17284 bytes
SHA-256: 9a4ba5eaceddf443b4ec88fafa34c0601938fe7ada783003a8087a75506fdf42
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 11308 bytes
SHA-256: 7583765792dbbe5827901023e90d59b0271b5158f11bac933365b9d4f7b149fe

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