Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1690b80d2e640d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 17:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c7d21a6d25d2fa603f6cc75b06873d03 SHA-1: 1315b069015cacbbacfd330f4558c1b0d62a2e4c SHA-256: cc1690b80d2e640de9be1ac66751f9b79285741d9c8b9dd7f997d2880441f3e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=dfx+player+pro+apk PDF link annotation
    • http://nollve.com/img/editor/image/file/dedekalonikow.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/28737628304.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/lopul.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392fe6d7081---miwekitukafutirol.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/80927957122.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/vevawapuwusomevoxokaw.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/zoberisenomak.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f384967e8f---19123994848.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/6010419227.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/42639964453.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/59944985108.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/jedagexodumigutixufuga.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xagijavexiwomiwoxu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141638427c9c---gafupume.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/faxivesomowejapezugu.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/79807957367.pdfIn PDF document text
    • http://strandedtattoo.info/file/77484390059.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/najevugik.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/wabexulutomezaped.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/duvekegivo.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_off0000b479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 16640 bytes
SHA-256: 793659be10a6e91c70e57b4215916f2289ced5ea5eb2f4dade2bfc91d55510af
font_02_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10196 bytes
SHA-256: 58eab0ef60e17c5afa71c431f1bbb3e568aaea27b03eef41ebbc232f3bbbf240