Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d82c43bf1e8a3a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 14:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8eccfd167966d0f5834cab54e2b3da5 SHA-1: 3c937b17c978d0ee950fe115a93fcfbd4973fbd3 SHA-256: a7d82c43bf1e8a3ab9de2d3c6e8df6ebd1ee9d67a29dc3773a2ccef13efe4e6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://laborke.ru/uplcv?utm_term=integers+class+7+cbse+worksheet PDF link annotation
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/92efb380f74039948f15e1968c7aaebf/83907899214.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb1ab58f5---4463433746.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c90138b6e5f---98837497601.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zewuvej.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/mowupepuzuxuvinotezepawo.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3211a8ff6190da9fe4625dd7db9fae8/gigab.pdfIn PDF document text
    • https://lemanssrl.it/file/minimeduwukodiwinivudelok.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/39009639076.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/nufesovamif.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/lobudelege.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/popibomizaredabudikak.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/58746019875.pdfIn PDF document text
    • https://davaocarrental.com/images/file/megoluginusikuj.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc7865c7d---81654903644.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/zerugenevatu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/53fc5290908cd89e5e6236987b5f4798/21536419985.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/47660013561.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/13492211875.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lututul.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/36591036698.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96eb31341e---11272909166.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/8782273167.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pusavitagox.pdfIn 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://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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 10736 bytes
SHA-256: 0dfc7fafcd0ce9dba7fb20fbcef1779fb4631225fd502c59746f46628f554664
font_02_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 16660 bytes
SHA-256: dc4477a8e824ef1eaee1fc4a9777499625fc79aa7b42c8d374092c030d1da040

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