Malicious PDF — malware analysis report

Static analysis result for SHA-256 441a71d17548b8c2…

MALICIOUS

PDF

90.6 KB Created: 2021-09-20 05:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa67403d75dc9ecbeee85afabe6de7d0 SHA-1: 12260858719dacef19e0a925fb5fceff1e1f65b8 SHA-256: 441a71d17548b8c20ccb057f3fe07fb8a3faa7f9793e6e81473c7d40e19a8a29
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories or disposable hosting. The primary attack pattern involves luring users to these external links, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://marupyara.com/fotos/userfiles/file/2906999469.pdf In PDF document text
    • https://tomorrowhubs.com/upload/users/files/95512479429.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/73946186631.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413bc401a8d---nalitonudepagesozitu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161362ce3dca77---21474465258.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/85643049907.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/83930250565.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614109e12389b---21702942892.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/bipisor.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/letegalanadafemenelebi.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/kemudupuraj.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/76250921707.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/32545585792.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/dajirubedozewujuge.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/kogukevube.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dfa88e312c9af0d2cf09a75792ace567/20470128365.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210919160239.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/duboredalevenemod.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/todulatamiranetezavet.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/lizisefut.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wofimenuwadejekefimanoram.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6c4c5bc73a25b9226d452996bb67e1d7/judukevetuxufowosoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=developing+the+leaders+around+you+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/73952492878.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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 11060 bytes
SHA-256: d19e28001d634fa9241b93c450b04a2899359e0a7427a5a6f9264a4a94a20a33
font_01_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 19012 bytes
SHA-256: 55f1698c8b4703425bcb6406480db9231d32295457716a7bb8f449c024b82db1

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