Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50ff0531c4b57a4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 17:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec98160d9746153c586bc8badbb92df7 SHA-1: b8a17ebad7144ff24e2ba4986c04ec5424ee281c SHA-256: b50ff0531c4b57a48c4290dd0d7f8d68fbfe522299ef18c0c0ae1ab1d5d1b2fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+make+app+full+screen+android PDF link annotation
    • http://studio70.eu/userfiles/files/36165183463.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/terabutasup.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3cafab874bb0db7e57d43da17709028a/84792566262.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pupadopivazamaj.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/wutiveromanugegagu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/7841493201.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/30225477212.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/97092555685.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/84821968009.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zixibuxuseje.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/lasebokovikoxetedajonakam.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeginomovovupekupokifexid.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vagizubugi.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210908175143_iuwlif.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/2887345219.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614153ddab794---daxedovu.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/mexata.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/42520442285.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8aea5e6c---jenowa.pdfIn PDF document text
    • http://retailcop.ca/files/67543015606.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/jebenatoxuwa.pdfIn PDF document text
    • https://eklyps.net/images/file/84652632497.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/31ae4e10355116cc3d248827a7e7089c/86301531898.pdfIn PDF document text
    • 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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 11052 bytes
SHA-256: 5baec3fd718fca59b0d9fbe3330306ad817b27d802ea773e0ca6b6a0c4320229
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 17176 bytes
SHA-256: 0da305c8b2d9d487bd1058f5a258a2accdb648efe176525c514e3c1b10fbbcfd
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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