Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9dd417b3c03a4c…

MALICIOUS

PDF

97.5 KB Created: 2021-09-15 16:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39533fa8829b2fc966b0e3a031afb412 SHA-1: 9bb5a35d7d8c02349830f5b93b6201d6ae3118d4 SHA-256: 4e9dd417b3c03a4cc0ff136a4719ecbb417c2d7cabfca76ebe9dee1dfce11aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of 'utm_term' in URLs suggests SEO manipulation for phishing or malware distribution, potentially related to fake application downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://smidgel.ru/uplcv?utm_term=pokemon+go+fake+gps+2021+ios PDF link annotation
    • https://hbfilm.ca/resimler/files/kavewov.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/93120040648.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kborstppla44stjdjh9ensn785/37538205668.pdfIn PDF document text
    • https://suruburi.net/mm/file/lijupeb.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/36295978296.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pilovolo.pdfIn PDF document text
    • https://sadex.pl/fck/file/20474557553.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/gepezezaputuwikug.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/zetigutarunev.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/50316800668.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/gufutoj.pdfIn PDF document text
    • https://euchebnici.com/img/file/79884222328.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/rasud.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/lemafosez.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/futuzoxorefeta.pdfIn PDF document text
    • https://labelmarket.eu/data/file/gifonemixi.pdfIn PDF document text
    • http://allier-genealogie.org/File:/64025871760.pdfIn PDF document text
    • https://ebooksweb.net/files/file/bumafawamosawifeji.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fojowavefurimitem.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tidefugoziwepa.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/zadimekeleper.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c48d717ce---nusuxub.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140164d03d81---28146278502.pdfIn PDF document text
    • http://ch-yang.com/upload/files/28799336425.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/lodomorisomome.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/42147510949.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_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10844 bytes
SHA-256: f97fbc3cc21ac17142d64037ae6f76c329fb93331e7b672f922d8a3ab4adf731
font_01_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 17708 bytes
SHA-256: 2ebdbe1e92863898c7c7566d7914999ecbf09e050a579ac03e6ea06c72f4a6ac
font_02_sfnt_off00016018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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