Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb269b931d4096a3…

MALICIOUS

PDF

168.5 KB Created: 2021-06-13 20:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fa24924a6d6718475f946a77f962caf5 SHA-1: d2f62e9d7e2bb666a9fd021468e189dddc4b57fc SHA-256: bb269b931d4096a3e383c8d544257e4b562bd8caabcc83b8cfd3c48c2a714d2e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=free+download+nba2k20 PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf6d1028e---woros.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bfdc9f2f2041c2af8ccaaa64409976f4/45371990998.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/65724110272.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/tuxomax.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2e957982e59b23a117114a230451fcf/badipovisegaluvosulebuvir.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/64v7ssae143c5tob99ofs4rc05/soditoturuboviwifijajaj.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20e422004---46554179695.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/1643341157.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608879cac6eb5---mimitotexebazelikuse.pdfIn PDF document text
    • http://cortabellanews.com/userimages/monikitivuxuv.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4026ed73---kugaridi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/wofonot.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/koleziwavofisam.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9f6f6b674189aac132f4613de2f0c153/wukupolololosezojoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 114616 bytes
SHA-256: 102f1839ec0ff385cbee37f0b1bb42ec2e0ad77be232d655918a08d423356d3d
font_01_sfnt_off00024679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24679 4824 bytes
SHA-256: 3a24bfcbf5aad24c79a2409513428ff210e858f226a54ee2e47ad0048f8fa70b
font_02_sfnt_off000256e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256E7 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00025f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F75 11276 bytes
SHA-256: ba56d5459e71387fb6b44564127e1de4dbbb0c1ff210046cd5e32c1db6c799e6
font_04_sfnt_off00028607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28607 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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