Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83a35157c13d3b3…

MALICIOUS

PDF

102.9 KB Created: 2021-07-23 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06ffcf5c537850d7f00eb35c3f82f9b8 SHA-1: 7e2c198bae71aa7a34e1b3b7b657069bf6cfffe0 SHA-256: e83a35157c13d3b31595f8a14c7eb399161d6e74916e1290f34d772e0528cb0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://electrabicycles.pl/app/webroot/uploads/file/16210280198603.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ob3fkdamkfenuvrc0d6s1rovug/xoror.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/labutom.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/lowejarugixisezuvases.pdfIn PDF document text
    • https://cubic.is/userfiles/file/63559684074.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a26004c11e8---70611037373.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8a43f5e1006c1342acca7c25b8798b5f/pojezosixapaw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090024bdc20f---pabonepemoxu.pdfIn PDF document text
    • http://vejwun.cz/images/8902388501.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e2686da0002---2770101219.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d30ec7477---68675090744.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/oh3leefubiar92j9l53smtpedr/99887113659.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcd3e6dcc1---jipavajeziso.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210620055654.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/91293733970.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de34a42657---89666475490.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/2642456890.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/70421832637.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/48194784187.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e617d48ac3d---8457601475.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a64471d22---bopizurawenijabajagafiv.pdfIn PDF document text
    • http://446888.top/userfiles/file/jiroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=quietly+brilliant+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 27020 bytes
SHA-256: 01f9adc363f82ec683121b734ca8038ff49a315df985a7fd27aaf4b5a04de878
font_01_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 4892 bytes
SHA-256: 261758394900f327badc963d201d7d80f41aeb442fe232de522f42af014e30ab
font_02_sfnt_off000143d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D7 16800 bytes
SHA-256: 840ef81e33d34f02b27a67a8bd79c40a8952948aa90e43bfd64d68f59863d903
font_03_sfnt_off00015c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17425 10576 bytes
SHA-256: 0c1745ec73a73e046dbb9ebd467f2d82a2cab874b60243b8e6dad33a80649650

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