Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb68b37ceb04a7e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 00:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63242ab5d2ea13330daa923c45d0479c SHA-1: 8098827ce0eca3b93d22db695bb3ea22f0a9eeef SHA-256: adb68b37ceb04a7e0d4fa3ce4b2dfd5895c388df8d46f7c3ad86b46df514c3c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://trivio.it/userfiles/files/jaweluresiwupusol.pdf In PDF document text
    • http://vekosgroup.ru/userfiles/file/xijaturebamufavobasisimiw.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/domedu.pdfIn PDF document text
    • http://caythuocnam.org/images/files/koduvimigux.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/40252278918.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e0481190---pevuxilisofajoluzoti.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/61171672393.pdfIn PDF document text
    • https://ms02bet.com/contents/files/57418390239.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148857159b3c---28312190961.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149605d92c25---53938731878.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/vibugemulukonimad.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/73834006216.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/xigopulolutuj.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/43801680962.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/4477716681.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/gireke.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/koxalonajawos.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tisozagimabod.pdfIn PDF document text
    • http://esangsok.com/upfile/files/265077646.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5dfdc5f60a2e1b7848973de85c464540/98586953030.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2bc55dff0ab77b9cc2312396e02db21/zugekugalamolananolumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jetpack+joyride+latest+mod+apkPDF 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_off0000aec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 10900 bytes
SHA-256: d6918a9101b6c01898c15b2363a25ccda79e909e14603055265aa5af6f0edb10
font_01_sfnt_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 15320 bytes
SHA-256: e529abc790526f213eb44c6100b139280a785b35b975aee4c4dce4177ec317ea