Malicious PDF — malware analysis report

Static analysis result for SHA-256 1595f4a218062c81…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e1e16276d400074c6b01b60e651e437 SHA-1: 7e4ea2bad63c100df1d629c5615b09003967bc0c SHA-256: 1595f4a218062c81e60b32df74b6f628c22b376ce19f8f41ea8268b45bec2a3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a small PDF acting as a non-clustered link farm on disposable hosting, further supporting the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://punaide.com/userfiles/files/xabinam.pdf In PDF document text
    • http://kaies.net/upfiles/21091809493860508979abom.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/23193990703.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/10763843196.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/16698147619.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/81733348451.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenorawonikurawetuw.pdfIn PDF document text
    • http://efrex.cz/files/file/67022932474.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613696ea09cb4---difisijizibira.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/posigokoni.pdfIn PDF document text
    • https://chilepools.com/contents/files/wijasikomitogetilugoku.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/77212567890.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/95558800732.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/fidowafexidi.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/40300933409.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/fugoxakepatito.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/67041966713.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/malexa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85222080b---57788683406.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/rekenobo.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/46197209805.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/kezeguwo.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/71732119027.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/difabalupinonosij.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fopakidamuwifij.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a25cca35836e97a4baa1e21b72eb75a/kiveguguban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dragonball+z+episodesPDF link annotation
    • 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_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 19060 bytes
SHA-256: bf79239ea37d147ef2aa0734d835fe1abdb6d78274b46a8dc9d3062aab583bf1
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 10672 bytes
SHA-256: a7a5a2d29bbb3acbaea2590042e17ce1532246b99f99503be8d0f959913df66d

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