Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac0133377696d95…

MALICIOUS

PDF

107.4 KB Created: 2021-08-05 16:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ef2fdd20873e28ea9c0637d0ef269b6c SHA-1: fca4a8f6ceac26bfc6eac8e64c530554381ca948 SHA-256: 7ac0133377696d954c86e8d5e446c9e5db1d8b02c976f1c02448dc996486de4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sztarmedia.hu/_user/file/23066186124.pdf In PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/df1a5cfe511aef9f169f48350fd539da/xizoxazazuwaj.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/daaa81135f3de9c3d0d10d24d68f0bff/22995936580.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f7f4938ef08f3f57a159b1c78782a252/guretawekoxaziviri.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/lixisodewugonaz.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/tesufufedugefapuvofagax.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/xajetoxexofitevojuj.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/29260992887535b3eff1f075839066cb/xalotamesusukojezufor.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4bd033df9021ea1d311eed5322d7b559/72084525534.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6def612b06915c2b730595c8194f8b01/57417550645.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e6164c8659f9b6baddeef7c8125f9d85/99787686034.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aa8638010---39611120058.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c197a984---61161777823.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/64401242067.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0739b1ec6a79f0a6e24fde11d004a52b/23713878531.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/45523936738.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/83842246185.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/suliwekaluxofirake.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c35d96786---bufisife.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/86651264759.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a61543b9---66150295688.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dafujesojuniregox.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/witamu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/aef1ec2fd8c91a3d432d2e9f39adf945/kanesuzodiledewijev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+are+the+arguments+for+expansion+of+us+power+and+against+imperialismPDF 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_off00013f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F50 17220 bytes
SHA-256: 5a621c02bbf67e00a7dd7ba3d50a7f96d35405dc10478a8dda0f3f13a19af004
font_01_sfnt_off00016b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B24 11224 bytes
SHA-256: ba3ad21e33a90f75742c90250f4b8b35055a4059d9b6eb65a88f888ab8bcb760
font_02_sfnt_off00018525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1