Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c5a4715695e2b2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 06:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19cdd3c2dfe6eea0cbb6d4bfaf861def SHA-1: 47d7a0625f57037f7f73f48118f9d010e5287d65 SHA-256: 36c5a4715695e2b2274adb05674236bdc6352cf7a445e342026a3d5c138834f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=salt+water+rinse+for+sore+gums PDF link annotation
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d341587ac---32972622322.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dotb6ed6462trg4h2tgvgeqqk1/39586620592.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0bfda4561---455236437.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf7b5fad0---devujivadoruxet.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e17a3e6a44d---sifoxufajujisigapunix.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/cac0ee813605d1615e10ec7770190a47/56703162366.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/pitazevevipewamixewexod.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210828135329.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/jomudiluf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e1f6vl862d1skahu7hanutj2r1/fanekeguzorosuj.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/dcd5a127013df33b616fc6eca92eb605/77699321367.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd5810634---lowixarasalodapoveruwufo.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/werovibov.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/jodazonefejutelag.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/2653464754.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ec5aa0a7eb1990c974af4ae0837a96b/taruxojimazalifi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181e000aca---niviwobejipokatojejud.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6a8d110e---bubogexujukega.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/39361067058.pdfIn PDF document text
    • https://eniedu.com/data/file/20210730001013.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/banibitojizisokaxare.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/20072360110.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/28813475666.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/12227530474.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lixad.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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 10816 bytes
SHA-256: ffbf868f20d750820d9bdf9f1fe4c2e8e6aa830e6aabf369d7ef2cdff0cee447
font_01_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 17620 bytes
SHA-256: 18a767bea9d47c3fdecadf8d71ff7f054374b2a90c186f4824cc104dced92ac1
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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