Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b5853946068d63…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 23:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5502240cd566898bf963ba2c6371a86 SHA-1: 63da96d2371a1d5e619cbd2f6af0a0049b7f6971 SHA-256: 10b5853946068d6317deec51d4c0a7611a294f7bacfddb76f811cd640ffa512d
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 compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or redirection tool. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3bf1c280---gubojaxoguzimafemijotu.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160959406b92c3---vimexirulawevarubalusu.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/92553929969.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e847863653---javuwi.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/5848558315.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8573286c9---87196240338.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/miledemul.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/sofoviputuzagonomileti.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/lajudexubekopetuvixo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608075d0bc380---dobub.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/visebatomovepenojodaku.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/74213966363.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321971ddfd---24781347752.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/20755396172.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/paseru.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/4129102034.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/16351487816.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/912322879608ccedb09c60.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330be12851f---98766118442.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/52316025073.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5b4b7808e2ecdaa8bc8681df43bc8394/14867239107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=present+continuous+tense+formula+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d080.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD080 16908 bytes
SHA-256: 6f89ee4be31483b72a9711fe99a0b0a75c0335ed31bb754e7cc204cd96400c60
font_00_sfnt_off0000b75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75C 10884 bytes
SHA-256: cbe05f57e0a72618deebc7cbae9cb963168c47eede1beb1540303bbe3507eb3d
font_02_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 21736 bytes
SHA-256: 0084b651c3ef5eb9e48326457536e58bc8acc2217e3928044dc3196f6cb41685

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