Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4962ce489355490…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 18:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3e76d9a48aecc370e2c998d9ee4aa35 SHA-1: 1ad0b0c025bcf68e4aef95f7918676f192fa14c5 SHA-256: a4962ce48935549024d06cd8143731bbf96ed11d2fe4c90f94be00e375767f36
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious purposes. ClamAV detection and ML classification strongly suggest this PDF is a phishing or malware distribution tool. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0gejcdee53kteo59fcj9j32u0/nixarizubopizod.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610100d70ea50---8817899375.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/l8fqof0j856l422mvlag5k6q3i/fakotonoperawijerija.pdfIn PDF document text
    • http://ud2-140.com/files/63750969959.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/tikulinopabetarivibi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afccb2b8857---giruwavebevakulurem.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bf320c578---12423899555.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/lefufibutibimulas.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bixidefumizaxijogoxux.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/523346cc4ba025609ec735c5939e962e/loxerixewunigol.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/83924128597.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/96575936012.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c993b5a9---xiwawolumebut.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/997f1713511e2b0a8f9898f2ed082d09/55603919585.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847f6ab7c2---77943435137.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/xileso.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/80453949418.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/5993852754.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/55206235406.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/89542719841.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/19494657876eb188cb6222d7a70e57aa/bewelenekatoma.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/referubolijuvogofufuremo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xugago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=features+of+oligopoly+market+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 11020 bytes
SHA-256: f3de0052a47f622e143da7784d430a853ab2d8001c83b8065ea0e81fefa2ec13
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 17940 bytes
SHA-256: fa85a4faa189603cc1d313562e28fcb56bcc8a592146695cbbdc4262ce117ea2