Malicious PDF — malware analysis report

Static analysis result for SHA-256 356d439a6cf4f8cc…

MALICIOUS

PDF

86.3 KB Created: 2021-07-30 10:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80bbf4489d931d5f136c2a15661899e1 SHA-1: 1975bfcc4fe96c56a2e76e0b13ff7a1e740f2df1 SHA-256: 356d439a6cf4f8ccaa630167c32cccba30b02cea65588b8aa022db23f4a24d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://brandweeramsterdamamstellanden.nl/userfiles/file/23157719480.pdf In PDF document text
    • http://aimic.com/userfiles/file/jalupof.pdfIn PDF document text
    • http://aweibel.com/Photo/file/13745905660.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/gumizuxubid.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2bd542bf---46666766625.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/19495568482.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b44f7c65e216d699b1331fd36a0c9cb1/saligivafizetokat.pdfIn PDF document text
    • http://fkhd.cz/data/img/79925106818.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6885318746.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe40fc2633---jokagiweniwokulonepiwovam.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7d46a216f632555a4dfbeed3e6c5d3ed/64817817832.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b2f71daa---jamolobopezerobapib.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/456c328d9005e8cad3a57cc0fbed5d02/60180320887.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v28ft9cth7uh23ehmotgurvbno/49383602734.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemitosijipubukaniwilaxip.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/01db29866607c9e1fe76ee1828a12a92/22053609079.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9048c9dd7aae63510c60d5b4991713d6/9684543361.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/45692501589.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/4524947223.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/506f1a9faabb88d5ea788fcb28d8dd13/vizotuvipenekerud.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/2749277318.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/49986799343.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087621809011---37436345590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=burn+the+stage+episode+2+vostfrPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 18028 bytes
SHA-256: 9bba8ea5c89f243da0c34df08268c94ded103f36fed7ccf21f339052c0584f42
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 16076 bytes
SHA-256: a788292cca142aeed5da50f6fe930e2a2735a94866157f12b187defed158ae4b
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 11068 bytes
SHA-256: 728166b9646cffd2643684ffcabc01434489973aa0406017bc8c7826eeeb2f54
font_03_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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