Malicious PDF — malware analysis report

Static analysis result for SHA-256 c355567fe7fcacad…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 07:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00c4e6d65e418c22af4694e5c519ff3f SHA-1: 8df923a7bdcf8f8f27cd888f29f022e155550b57 SHA-256: c355567fe7fcacad6371572aa8ccb043e110731fdea7c3b058ebe326093606a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to lead users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iskoruma.com/upload/ckfinder/files/fujosotafazemunetodixog.pdf In PDF document text
    • https://steammining.com/userfiles/file/37223340702.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607011c8de56c---49318216215.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b31c08fc7---69942433596.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/salogajepodujezizewusudel.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bbfad230---84772896902.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/wutuxezuvug.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ijr5mlgvq1lg93of13oqgbojms/95316798708.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6717256758.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/97tjrj0sph4mhibencfd41ldja/2874034646.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608028e71c267---bobuvekabibogosezuxe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16085343d66d2b---34314174879.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9541e710f---tewunosazesomamixigimafaf.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/31q3493kr341hpvgeg1utjc05b/kawuwefakurafik.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/natefefokeletonukem.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/56755840903.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3ptm0tqdl0quenj12o18spm4b0/61713853609.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0080c335d2---sosepefuferebeda.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/52441211982.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac686639d1---65896115568.pdfPDF link annotation
    • http://thepnguyentran.vn/media/ftp/file/75806721889.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f670a28d0---duwataxonawezemazojeb.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/646570914611eb295be702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=all+military+ranks+lowest+to+highestPDF 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_off0000bc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC05 10828 bytes
SHA-256: 91eebe5fe6cb289c9e818caa0dafe9f691e81c550745032dbb66d8c4f6da3f28
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 14668 bytes
SHA-256: 8ddb32fe63cdd0f3c4bf34db4e1e39b32e69d8231cd2d730213797954dcd1e09

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