Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c7cbfc965f647…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 21:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a39ca9fccfbfbbfc3d3a686c785755 SHA-1: 1385ad7aabbade2f7a27ba4f3a04d0cb1ce20c3f SHA-256: 2f4c7cbfc965f647097949cddfa07453f58ceba01bfe16550fc3f02d051313a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to direct users to malicious external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=autocad+civil+3d+2020+tutorial+pdf
    • http://djpress.pl/Image/files/kivavawefuxebimosupudip.pdf
    • http://liga-stf.ru/i/upload/files/nikajiwamowubeza.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613318ff79a78---18199738831.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/vegesi.pdf
    • http://soncongnghiepjotun.com/media/ftp/file/90324436155.pdf
    • http://schokofontaene.de/idata/85092693840.pdf
    • http://wych123.com/upload/files/ragido.pdf
    • http://pumarecovery.com/userfiles/files/75332024250.pdf
    • https://iuoshili.com/upload/users/files/98613492133.pdf
    • http://utpcomp.ru/uploads/files/dagoviwezazixenugar.pdf
    • http://toyteepee.com/uploadfiles/file/21090112315154580271vikl.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e78bd49a---fopajoka.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekavupirezabikorimir.pdf
    • http://biplano.eu/userfiles/files/82371056438.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/wutak.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/bojapedilitekofe.pdf
    • http://berbun.com/user_img/file/pabafedaganuroz.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaee62ae45---79734089542.pdf
    • https://akproauto.com/nbloom/fckuploads/file/8746935601.pdf
    • http://cuakeobinhduong.com/upload/files/85030809538.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1e5.bin
ec61711d9a1e4f3435ca838616601b87ebd2da9b424b6f6264f072dd3d97ec49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E5 10772 bytes
font_01_sfnt_off0000dae6.bin
7492fe6ac25a574c25eff164d3493e7c2c3751a3aad93b42eead221196b65c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 16808 bytes
font_02_sfnt_off00010633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.