Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95e7173f5c63bd9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 16:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f0039139a3b65bed8a1c895a42a5bc8 SHA-1: 3b1fba891fbb47f428ea6e697e0ed335b7c107c7 SHA-256: d95e7173f5c63bd9ed0155f7caef976c0d1ae8bd9677c0a730c1aa8ec130b6e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised CMS uploads reinforces this assessment.

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 https://skiclubraonbaccarat.fr/pdf/27818353382.pdf In PDF document text
    • http://geteffective.biz/uploadfiles/file/texitupimidodu.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/novedaxiwivel.pdfIn PDF document text
    • https://csodamalom.hu/files/files/sonin.pdfIn PDF document text
    • http://entrackintl.com/uploads/pakepugitegesejazofegupox.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb6c65a7d---kigabejixizam.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/zizawimalun.pdfIn PDF document text
    • https://produse-zilan.ro/files/gejezuwolisatamufop.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/75048406110.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gibalililekafotusemi.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/fuzedutivejenelo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/61460980155.pdfIn PDF document text
    • http://nanopena.cz/upload/file/vevivulem.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b5d6df32---38892678947.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/30282680185.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109182147213490.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/rulefotepidefijenijewalib.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/12367922200.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/4827348034.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lunesixewezuvuja.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/rumarik.pdfIn PDF document text
    • http://gibisch.biz/files/files/95775715469.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/666992615.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/55925140809.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b2c69f87e---wokikasunagafakelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=install+apps+without+google+accountPDF 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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 19232 bytes
SHA-256: 0c53570ce3bbd7ccfc924176374b424a4936e6bc63fcc40cde34c9f5f674b8bf
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 10688 bytes
SHA-256: cb151fba31220befcd12c7ade5873d10db17a5afcbda45dc2571ebd8f9346bd1

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