Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eebde6eafb5b966…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 21:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 254ff88540a512b579f143c021db5a8b SHA-1: 6f4006b3f4f69a884d1b71b78b4c62ad01a886e4 SHA-256: 8eebde6eafb5b96619e9dc67eb851b8164c5c03d419a54be98fbf3a9557011f4
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=australia+map+pdf+download PDF link annotation
    • http://maiodi.com/userfiles/files/rejudawemipezu.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/74471255191.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6483c6af3c---15351676424.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/wanif.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108091147546212.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/88329563646.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/94392910976.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f19700d8d---pumapuxa.pdfIn PDF document text
    • http://yuli-china.ru/d/files/wikadasu.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/92459314529.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kipoka.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kipofigamebekonaragimufen.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mipininapufevevelax.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f5363e9a3e0d2e642cbe70914da6f817/pesupugumin.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/xigazunijufomezixotujaniz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc290553be---56191508770.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vatimowapoxupa.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/biwojibuxox.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/74011302395.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/3639625641.pdfIn PDF document text
    • https://brakos.it/file/baliv.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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 16744 bytes
SHA-256: f6c1d4e3903db6eb2fdc5de503d1c79d110b5ec93bc47e42592af783cf90ef99
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 10692 bytes
SHA-256: 583acf2b73a271153d7719561680bc4df35f4ee98eea29b9b6c98b487084f212
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1