Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6f0bca22ff135f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f817f057a24de35ecf80fe3f123a00ee SHA-1: 6ab4b7d25e5c72b4f3b5f21f8c55bb382e3d7b68 SHA-256: 6a6f0bca22ff135fb3d006879ad0daa4663ce13af0bae87770e9d44f4718b4ba
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malicious content or phishing for credentials. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://studiorestagno.eu/userfiles/files/49065364489.pdf In PDF document text
    • http://tomboy2.com/images/library/File/binojabosirafuvidugu.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/34472930411.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9c5877f13ae10a783ce69002e2808622/vijud.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/89051004284.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/95275667297.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/lerumaruta.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/sasolopode.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/sisopa.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb1ce83f2---55689931379.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/18834346940.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/turujosuwefowomepuzisu.pdfIn PDF document text
    • http://tion.hu/upload/file/85086876847.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/69776916001.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dd4eccae---fivovozajinojiwapaxa.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffff02beb8---ravav.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/tavivon.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tipaxenuj.pdfIn PDF document text
    • https://windscrm.net/files/file/73753978416.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46978605161.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/negenezugebokumi.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/43838064076.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/15975428048.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/giguxunizefesuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=samsung+galaxy+pc+suite+software+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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 17456 bytes
SHA-256: 1cc22ed694dd3a2aa7db265d8859a26948126bbbe989760f027d88842a00d007
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 11440 bytes
SHA-256: ce852045791130dd5fd78a4621f84601b7f9f0d5a59f97e5865208e75f82c85b

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