Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a165f02f8cf7e2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 11:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 558e550f16239cdd2257033dd27af54a SHA-1: e3fa0baaea8a3adb0296c4a454788431f50de99e SHA-256: a7a165f02f8cf7e27c7765566fbfabce456c012c137f14661c6e15400a90f651
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=german+stamp+catalogue+pdf PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8a672e5f93209cc3e5e63d3f5aad3360/vowifodurobomivufeke.pdfIn PDF document text
    • http://alvitraders.com/files/46916010430.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ea8d5f3705cf957721baf389a69e9a15/42312032043.pdfIn PDF document text
    • http://tencanpowder.com/d/files/pumegarejokejow.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/2108160254246822059alj4.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59053226578.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c73f4fc2b---pubixogitovem.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/71084131483.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kovogolosikivaros.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/26480127538.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/mujuwizuvovomejedip.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9f69818ee8b4ca11211d62b42693f6af/nenomokakefajikujesonowo.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/bifilavevovupi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ogioa6dvjlb0smalapvqs52bhk/99408518451.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/baf05389adaf3911c0408a4653c34af4/17713670467.pdfIn PDF document text
    • http://regcureguide.com/files/files/temun.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e43339a64---78741575343.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607936d959db3---masozodosamotubok.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pawusiledoridogojosa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/lodifafesigazuruwen.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/29621608613.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0a4cbf1e---77371022845.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/61342964840.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gugevegejotetanodowutakav.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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 11012 bytes
SHA-256: 6f8a133112bc008cb106aa4dc7925681fd8b5dc8b4bfd5faaae4a634ce2406a9
font_02_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 18564 bytes
SHA-256: b5f32a906982f2a3d71ef989d7e4039761c62ad130f2b8ff765ab58c6f0eab23

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