Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c75c1c289c1caf…

MALICIOUS

PDF

88.6 KB Created: 2021-06-12 16:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0db78cb49fae1034cc2f1e7cc9d3f1f SHA-1: e92bbfb2fb87180b47f3e6ad5df397094f87fbb6 SHA-256: 97c75c1c289c1cafb4cc73b02e5bb863941b4dc905355d8b6182b5fe07a6ba85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=miraculous+season+4+all+episodes+list
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/51e3f95a98ff95487bb7af40c8e58bc6/63443051890.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/90182130441.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qvdicedj7k3e461no3en2pge8f/xakalijowanobokenim.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b42d0ec6e---25444061576.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1a377b44---zunakoxewuguredipepume.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0ce34e831eaa48b1703de184cf2f8287/bovezivazivo.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f16cf0465---52551698587.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6902b037d3---funaveva.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8950r2rsbt5f1mn1a3uic37jbh/58570863922.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f68bebed---xodoziwote.pdf
    • http://wabasnb.com/files/fckeditor/file/63048797860a7b5ba3129a.pdf
    • https://eyetracking.pl/userfiles/file/mazuxivaxu.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4ab35d75c9488530f65b1c6561edbd9d/zilazav.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087593bbe478---19857481192.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/isr01phann2iah7l8o3s7qb61g/85481598106.pdf
    • https://cardion.dk/gfx/fckimages/file/37026079872.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec25.bin
36ede862c6a88d4915b3b021482485d31d7a48aaf7defb832ecae1311d8a0d1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 5160 bytes
font_01_sfnt_off0000fdc8.bin
aba32fa15369b22fd12ccc6ac6a600f555fff35621946eb9c755f65f36206bc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 4364 bytes
font_02_sfnt_off00010da5.bin
a72ef756c14c30c54956ff462a623540775dd7ac7a69933d2b8fdea1339ad96c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 11708 bytes
font_03_sfnt_off000134e4.bin
31a5d0c1ab2074586fb0354edbb7c87bb8a4f68650915cb404e56556e181b317
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 17176 bytes
font_04_sfnt_off00014c69.bin
1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C69 1736 bytes