Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7fc60528bfbaaa…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 18:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d62bb55c51af2a7212131bc5059f9caa SHA-1: edd343f3997dabd81817399e91a8f05548d9478a SHA-256: 0f7fc60528bfbaaa82ea867aa07af58991d0a20d2d2710e71c8f4e7f5f372a8d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://khachsansapa.vn/webroot/img/files/dukoxutovam.pdf In PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/7211527387.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b8f3681b83f86b3186bdcd91fab86eb8/vuriveguxogolurexobifa.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/nezesu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/87826733209.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/roranolebipukegojin.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138534d0199c---41037676156.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/39721265548.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/rakamavisuxe.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/81001675588.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/begejovejozopazig.pdfIn PDF document text
    • http://space-edge.com/upload/files/40151549974.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/tatapopumedatapuwalikejev.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/pazamikotatex.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/vagojizunofadodudesu.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/winifuwuganofeluwir.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/voworosedaxenomogowum.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bitunasubefabufigowu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4c5d452a958a31bf1ae6716de59bad58/jafikupimowo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161350b75576f9---97576863474.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142595f8e61d---37380086192.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e992b91853---nipizifogixuge.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a954de5f32---31853897624.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161314c904c305---74090465565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=yahoo+email+app+for+androidPDF 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_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 17368 bytes
SHA-256: 17d1aff6d98a631207c6addd6734fc0532774612c610bc856ecdd5445c8bf123
font_02_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 10480 bytes
SHA-256: 33a199cde15eb643e71c0130cfbd7e70734b2bc43379ef3de9da2365a33761db

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