Malicious PDF — malware analysis report

Static analysis result for SHA-256 c576bba93a9bc987…

MALICIOUS

PDF

99.9 KB Created: 2021-09-02 07:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9aac671ce93bf7f938c644658adf9e0b SHA-1: 2d73d8d82ea61aaf4b48121f00867991ab554ea2 SHA-256: c576bba93a9bc987ef10e4aaaca2c321214701263f0cad919f99117ec09c0612
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains a high number of external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_URI and PDF_RANDOM_URL_LINK heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff24995a8be---kuruberemirerigulimu.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609098734cd69---fagukakupojoximejix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb83dad64---62275604035.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/20387544839.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/64e0b701b063929fdb95e1a5c9d6eb56/46510631937.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/getoj.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/10134504817.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c58136e636b---foxalonexepep.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/10333405557.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/21686873702.pdfIn PDF document text
    • https://le27.fr/docs/file/vinivaronubiz.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/1019190921.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/v93m7alq04d3e6rpgkg4ii1a02/95938019010.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/091952581218.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/9345770044.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/roledupugegivugedapevuj.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/dozaxogolonubifulononeji.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/86a1f96061795b571a1921b42042ee13/72008051492.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/10728409791.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/perijivavatoluwevino.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910c594b182---34113824467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=earth+materials+2nd+edition+introduction+to+mineralogy+and+petrology+pdfPDF 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_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 11384 bytes
SHA-256: 3947cb7e62d145c869458cfd587d7b54f478ba4b20984d8d49428cda52f176f9
font_01_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 20264 bytes
SHA-256: 078eccf287c6296594c830c05ddbc5f71e6a967c4b112f4adb484f0599d143d4
font_02_sfnt_off000168cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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