Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbca8f7807b6643…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 14:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1536babb16e6267edd21dd20e8a4bc40 SHA-1: b8c2d1dbdc6cca2de3543d170f4483259802468f SHA-256: bbbca8f7807b6643fe624b7d852a2b150c28d589985caf1bb50b601afcd0a043
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Additionally, the document features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories, increasing the likelihood of a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://busankid.com/webfiles/board/file///37089924101.pdf In PDF document text
    • https://ismart99.net/upload/files/46492493283.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/9626542150.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ed4f45049---70866067063.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/20927597141.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e00b8ae9---38580137402.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/38441546409.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161327d5de0eb6---supelebos.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/94673274723.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/19c96587a277c5483efb38e327b269a1/77224113663.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dojezito.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/84897009741.pdfIn PDF document text
    • http://shesob.com/file/files/36682255728.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/19439771979.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/watelarovatu.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/85145830448.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///46077965191.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/92274058733.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138324c90c0a---medipiv.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/deselamawunapumo.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/3541156008.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/feworofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aplikasi+pemutar+music+terbaik+androidPDF 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_off0000aebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 10988 bytes
SHA-256: b7e02692c96a2ad04bfb8fb4ca316617688661f5013070aed3f0b059a069c4cb
font_01_sfnt_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 15052 bytes
SHA-256: 16c0ea4dbd9a7939895f2f65af377ab84eb486dc0ddb66a008007d958274a2f1

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