Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60b9d09613a90e4…

MALICIOUS

PDF

73.9 KB Created: 2021-08-25 02:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 348a7fce60811271e814a8ad2660b4c5 SHA-1: b23ab018292ae8293bfc145333b39569459cb886 SHA-256: b60b9d09613a90e484162b24120a06f35b8b3460e0a5b04ea60141a376705c72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious or phishing content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://qfuse.it/images/uploaded_files/ckfinder/files/1627441572_897b99d82e.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0108f70e41---73247916149.pdfIn PDF document text
    • https://curvy.tw/upload/files/82226040266.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/finewipate.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae39cca6b---pexupased.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l04boobjjee1qacpk47es5jm9c/kavemamoxagufezu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/800df86ca04277bd44b51540d610f355/vizeg.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/303508685b27a98891e2fff6b0c64219/80675108068.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/11af63a6b9f52cd044964289d143ed12/20251594011.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qp4qhargsitb094pe3kj90at1/79784627312.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f200b01a7---88076278111.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7bij0fi4k8111194hbuh3pnqr7/37639202297.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/14678580195.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc57174be5---lulugibir.pdfIn PDF document text
    • http://cmtsport.com/pliki/69364256623.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4628bbc2---kulejumiruwiniganixoka.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/92659211309.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb6bca811---62794040055.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/zibefabe.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2tegceu4d1vem8gvcoptja6bch/vabasevoxetokezun.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4cuk9dtgj1buf5e81sjb01vpqv/fovufifonugeripigepawega.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/mawerunuf.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/92924164493.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161084203b92fa---gumiwovodizurajilo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f311ceddd---legalujitowomaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=little+tots+daycarePDF 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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 10332 bytes
SHA-256: 7d1a43c692a184abbb28fb20dda0d444c72cca4b6313241a7f24a9eef48e446d
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 15908 bytes
SHA-256: f7b8f0c58470245c2846ffd252e1b563132ec1d435993894592dd3b9c20afc48