Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b871ac20015d63…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 01:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6342e1d4239551c095f0fb2d2c93b30d SHA-1: d06b91a239e0757ea78ef6502455bd4998687ca2 SHA-256: d0b871ac20015d638e4cd19a9286fdb3c80318ce825621af396fb9485367b299
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The document also functions as a link farm, pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=logo+quiz+level+2+answers+with+pictures PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614777f4c4630---37657549090.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b43767191778944c2a623655bc1d289e/31628038214.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/79836075768.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/wajoxevuz.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/10364892186.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f2e33e8dbdd940acf28059dfe5d692ae/87427498020.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/68054022917.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/52822117925.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210924013106.pdfIn PDF document text
    • http://surtek.biz/image/files/20150409_134022.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/62738946589.pdfIn PDF document text
    • http://24cvety.ru/upload/files/71912921058.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/36725904437.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/nadasosoxapixuren.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/8281685302.pdfIn PDF document text
    • https://salwangurugram.com/files/1535429254.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/11622134209.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/pinavibutirera.pdfIn PDF document text
    • http://oris-am.com/editor_up/30028562879.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/wijumofakikaboluwofexu.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/wiwevugi.pdfIn PDF document text
    • http://spharma.ua/files/file/gojelosigojonubinepab.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/foxud.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_off0000ada2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA2 11188 bytes
SHA-256: 6884bb13a056b700086268c5b8c0182c22631ba9c49de467e95898c6ccba20da
font_01_sfnt_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 14996 bytes
SHA-256: a5c19b6429509fcd14baac0018cd4f887b40d52f9319236352e82efc29c933bf
font_02_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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