Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0a9c03f11de824…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 11:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58cc8e5a8df5433b1c15ffa8310d66af SHA-1: 1ac64804dfaf8507c1aab71779d05bfb389cebb2 SHA-256: 0c0a9c03f11de82493aa9e6d8658ef257f0035cdc1948ccbf76a60c0caf6cfd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ClamAV detection indicate a malicious intent, likely to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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=raspberry+android+tv+box PDF link annotation
    • https://oreopay58.com/ckfinder/userfiles/files/24779348496.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/zawetaxezarogoxetub.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613604b9be766---67387660611.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_209CECA21FC4E6E2.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/51234051445.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/tenoxuxivivifatif.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/17197202770.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/31355382258.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/jadofilusapokalirib.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nitowovupaxelawisupapud.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/53788374474.pdfIn PDF document text
    • http://amdind.com/userfiles/file/11258801317.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/65188772215.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3rahfkphgf0c3lhcltn4nakbm7/95010473239.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e1395f7a---37688486982.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/1175460921.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/toxutosudop.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/xopofururojagatad.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/mivipotomonaxivo.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/9996635041.pdfIn PDF document text
    • http://riph.pl/userfiles/file/nokeguzosidigokasiduzux.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/xexafirivilabijomoguzi.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 17064 bytes
SHA-256: e0f3efe2bd0fb8e2ced7a5ffac6ccadc53ce7780982e99344594d7fb1743cf46
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10804 bytes
SHA-256: ca57b9eee622594e20084c0badea8359f7cafb0c8e11a199b963d9f8e10d1f0e
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1