Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c4d7b630b1527f…

MALICIOUS

PDF

82.8 KB Created: 2021-07-15 16:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38a4781161fd13993bc13b017b4d18d1 SHA-1: edfa2ab457ae3b213776e74f9446f5a924d79840 SHA-256: e0c4d7b630b1527f1a3fcbc60c4435043b5d605da6c9463308e1af4045961091
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Several URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document's structure and numerous external links indicate a phishing or redirection attempt.

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d11999c0---torumezufarupozebaredakuk.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/72647934c4fedc43752df985b7434a6f/2263800563.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87de9726ef---10743240723.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a4884990---xuvijafonobaj.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/rovalekiluzizaxafa.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/solore.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77524288148.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/14610701270.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c755742237c---lemuxasib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/64472835607ab17a2c04c207b2db1532/luvuvininadopoxamimuwewo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ivslqjcskofuonfaitnv00b3f7/rinanerorabadigaxipetigim.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/afcd5d3491843cfda14804650e349c06/74040229344.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ditid.pdfIn PDF document text
    • http://mid-europe-ex.com/lifokaru.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f0949618---xemozabanu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/74bf50c59b40fc7784773ddd026cf484/xafevaxapojebuvinugowi.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/41227375953.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/68e136dd6e97a93d2763e243b39f1e3c/vafesoxoxavodoxudamunusir.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0335b27dfe3f76aa60c6c54e2e9127d6/gelaxanezutit.pdfIn PDF document text
    • https://lecapsuledigian.it/file/91999392286.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95ad9fe51c1ea77c1c3f020d4dee3f7a/16898555683.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/depokezafa.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xiwidasatudugimixixaloxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=preparation+of+buffers+lab+reportPDF 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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 10592 bytes
SHA-256: f34a00ea9ed4705427c47e42ec412deaf5d77905d916dde034a9473d8c6b3746
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16104 bytes
SHA-256: 23881f84e55750e259ff9e3d8ad06af1f9752362568ecbccc7d738d2c748611c
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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