Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2b2ba8db90dbbb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 21:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ea3ef8f066e35f155a463ff67357cc6 SHA-1: 172884af104b00b311e9ebc4769783429af9f722 SHA-256: 1b2b2ba8db90dbbb67b02f350febf01ae9b4806e428c9892e24afcd29ec5138f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=the+descent+full+movie+hd+online PDF link annotation
    • https://shevian.com/images/file/wosowipabevumipenib.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/loxaxejisi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/69338402438.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/59304802951.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/56596891148.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/22529756675.pdfIn PDF document text
    • https://businesslife.com/content/file/didima.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jukubimozijem.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40197137574.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a108f3439---nelumager.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/67776622222.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/85135049473.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62925282b---95456295217.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9040c2e49---50575584342.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/toxolatokasinosezoriton.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/51093067320.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/82a61f0806beb3ed9d3c570f8e004cd5/pogozevomiluvusufa.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901192418.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/82441953526.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/66235939292.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/40171887612.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/586775160.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fec874d257---50167554622.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/nujikovexiro.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_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 10608 bytes
SHA-256: 1bd20af79e193839f871f3f0770aaf93f98d4fd35773cf96afbdb3a4bef64915
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 17272 bytes
SHA-256: 417da1882d1e3861ed710edf0fb0f9a285b975331965c62f09209767212046c8
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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