Malicious PDF — malware analysis report

Static analysis result for SHA-256 e421f080cad134af…

MALICIOUS

PDF

100.6 KB Created: 2021-08-25 14:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 676442f42fd1557583b85bb43d8a14f0 SHA-1: 208a9df718ad9c077e815a6fea2376bd2b495eef SHA-256: e421f080cad134af38b419c8a420d99ddfcd896c8ba6c2433ae6f1dd4fb1bf08
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Multiple heuristics indicate the document contains a link farm pointing to various websites, many of which are hosted on compromised CMS platforms (WordPress) or use disposable domains. These links likely lead to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/286daae65ab94e84ea2f0bc9cb0e189e/85300999162.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fd41ec1ba405c01237c1abcd2f34d8a6/wuvibomojogalinuxa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda88a1157---fipunobavivinuxagom.pdfPDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16073aa9025604---9921789376.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/bararitejegiponusozulada.pdfIn PDF document text
    • https://artenika.pl/fck/file/38857867243.pdfIn PDF document text
    • https://menu2uplus.com/images/file/88415744951.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878be6d83cb---gulugarezufowitirekul.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/6821234922.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2e9b4eb8c56c7fa01484d6c5decb4fc3/16260574605.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/73049774688.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/sufaxekofumik.pdfIn PDF document text
    • http://becucci.it/userfiles/files/medomosez.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609762a2bb712---xokevawebiwejuvoludone.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c02bed6e3b8---47896564990.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/76743625562.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627576489.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccf0584ca---60326731605.pdfIn PDF document text
    • http://airfa.it/userfiles/file/nukimatomekiju.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/segufusidobilake.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/62178103346.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/pokalefomekiviju.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vixozupepa.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/86322132325.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9a5a1265cdd34258d57b5f24389d78e9/nekugumogufoxakejim.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2357fc34fd---81452465981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=most+expensive+car+to+steal+and+sell+in+gta+5+onlinePDF 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_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 17556 bytes
SHA-256: de088605d07ead7d3c5c50362fda89b0ba18db19e89aa9a035d3d956f7b70cdb
font_02_sfnt_off00016979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16979 10984 bytes
SHA-256: ebc8404283bdce8af9d57e65869c99d2e67caf0061ea298d1421766ae763e748