Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a9441b3518f656…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 14:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a14e067592257a0cdf40752f3e8869e SHA-1: 40e5f49a28037d8df9251d4d4443b4420be9f133 SHA-256: 58a9441b3518f6562a95d409e3902a9d6116d8c3298c2bc68726363e27a76598
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure that likely leads to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ppsc+biology+past+papers+pdf+download PDF link annotation
    • http://polipadel.com/userfiles/file/gusatuwiwetokigoxaj.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/22408346304.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/warudemolidired.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/41331123692.pdfIn PDF document text
    • http://chapelguild.com/images/usr/18163334266.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/91450830826.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf18dbcda---wifelevubuvugugifezasu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e901851e0---60264614555.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/657107096.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073db3216698---59999239428.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zetuzimolamilujinefinife.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/fanojozab.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/55399506522.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b45d445fe5614e6dbf4e8f720e629fc0/46042165872.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/20665756366.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/18768705972.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/936799254.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4384eca5---mikisapolarofuzaxademiwit.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/9626609521.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074c48ea9743---62110687290.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/42576277431.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/78639386921.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/wasisebil.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7412c6784c6f88abd14653952590efe3/29499147684.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_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 17364 bytes
SHA-256: 0bda69b6ac6e945f52a7d618051aeb61b19dc89043de19e5181b9daaab874b86
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 11136 bytes
SHA-256: eb94ad6f0cf4efd313aca681fee20ffd10066a53dcc7ab2e73d2304c82f9f5e6
font_02_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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