Malicious PDF — malware analysis report

Static analysis result for SHA-256 10407f85a200a63e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 18:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6246426ca437044f96298b7080c9d0b6 SHA-1: 2773d8f34ad50a3e2027a6481159c84892ad1336 SHA-256: 10407f85a200a63ef8369a87637a2b330a0cfa88900f29e191aa141ff5cac1bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous compromised websites and potentially malicious URLs, such as 'https://inwebjor.ru/uplcv?utm_term=adobe+lightroom+full+apk'. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=adobe+lightroom+full+apk PDF link annotation
    • https://southwestlooms.com/admin/userfiles/files/44415679230.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/gituzofupodilefimid.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/39323180166.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136761e37b6b---17190739050.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132a296240a6---kujaf.pdfIn PDF document text
    • http://flirdining.com/uploads/files/9737181476.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/35776675999.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/23436571928.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/jakeba.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o3m9bj1gfn5b7plkt9jtn39eu2/dobuwedodomux.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/paxozovojixuwa.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/niluranexev.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/12528969347.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/rosivusidajeruzirisidu.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/mapup.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa0c7e569---lenudiwali.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430581cedc4---tilisosujotadipulepeka.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109080809056531.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8585334858.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161321605d7cef---63330004067.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fasuwusamu.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kojobu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dade0725---kejifekositit.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqk6ufacu77icr7ak2k60c93tk/43793520170.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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 17340 bytes
SHA-256: 93b7ef9c48d2ad2337a8184ee20305b35b2c2579234617e4f9825c8aa2a0f24e
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 10984 bytes
SHA-256: d804d3c5fc0f73e762b5d56ccd8ff633285413df699dbedd1bc2e197e846e5ad

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