Malicious PDF — malware analysis report

Static analysis result for SHA-256 6565f34e58d83913…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 16:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85a951d754bf097899f37394c7928af1 SHA-1: 72d7720f4744f40b45e581714f2fe236e1229724 SHA-256: 6565f34e58d839139e2188f55608d03bb9b5f7797d2a71e22f15ad63a780fb43
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating a redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=area+code+pasig PDF link annotation
    • http://studiomuraca.eu/userfiles/files/wubuxajexivosebege.pdfIn PDF document text
    • http://wixoon.hu/upload/file/11068645374.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/jutimuri.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/32760994515.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/91653716423.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/xafupifalejome.pdfIn PDF document text
    • http://carszana.com/image/upload/File/40268712971.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/lubesiziravalikiluke.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/35145310606.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sj8gqb6n6g9gde1mld6nd0fccj/78708950002.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f504f8734d---medimerexezutisajezesam.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/safavurijazovubujo.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/66802783590.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/23636990353.pdfIn PDF document text
    • https://euchebnici.com/img/file/xotifevifinupazoleza.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/dekinazaguzadebik.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/45093180682.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d0bb82c29505d7cc4293eea0e31f20ac/62499724916.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd4a3b8c2---91281657923.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9db8aae2---jukilajimara.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/47112604898.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/wudebojubojebiwave.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/vuwuwevuwirezemapinor.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/tidujawevogilafuz.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/27470339931.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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 10420 bytes
SHA-256: fd61b0777b7573c3366cdeb02c65439bdb35d4a62c399cd8cd237ab68d9e105f
font_01_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 18648 bytes
SHA-256: a942f9d0e90ec91742295e952d6d5b49d9d68a74f030184d6d5cde62e727a94b
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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