Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ebdec50e9a00cb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 21:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61349a5824cbbe987fb98b44120ca660 SHA-1: 588f720a8e8c30393f9325923d20a45f589034fd SHA-256: 42ebdec50e9a00cba625a4e31378c2d51574af9683053ae8dbf496a5ab1ab430
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update to view content. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, likely serve as download locations for malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=unfortunately+app+updates+has+stopped PDF link annotation
    • http://ping-property.com/user_img/files/99608352121.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/gewijolakafabalizewoza.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/51743924938.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/o0gaaq06eo3kvc7s2eregeptab/fikigoweredimerivisap.pdfIn PDF document text
    • http://delve-cr.com/uploads/jajupasugexapafinijatasob.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb14ed69c---68865532561.pdfIn PDF document text
    • https://cmf8.ir/data/file/jomutisodetuboxuwo.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/21167378287.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80283713207.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6c58e3cb---rofazakomatatoliroboj.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903202655.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/xegofepufuw.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b2ac2e97---46719130991.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0d00b464b726f704e45f3bb34499fe15/52611771998.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/lapabalovipusukalojop.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/57634378055.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tukatujikizirazobite.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/roribodixixabosafutozive.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7f79lktofno39ifb01rgco2u2r/sewejinofajulew.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/2342467506.pdfIn PDF document text
    • https://fratellifurloni.it/file/kotasubukuladi.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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 10724 bytes
SHA-256: 370d5c4d505b5df7bbd3aa2dab750a911bc8ebac1dcbdcbc6db4e6dffafa330f
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 17468 bytes
SHA-256: fe003e20a3f9dd3a437e2be0dcd6af0b1df3a7f62237efcae90677b217f8d044
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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