Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9478fd587922752…

MALICIOUS

PDF

88.0 KB Created: 2021-08-25 05:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3aeb0be9b1d53e117ff61ceebc316ae5 SHA-1: 85b8986c38edb927adb979bbe164ed8792a09fd7 SHA-256: b9478fd587922752b3fa60e9ef8d8e7a2aa3d92a9146a9e3db431cee1441e368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/67921488671.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfc592c98---26254088883.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/xagesi.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/48220454088.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/71454359600.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e687b7aaf5e---pagudowamebagi.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/8926126721.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f696e52d55---zivanupozativusowesez.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dce1b94e---xakapuzelakapekemujuliv.pdfIn PDF document text
    • https://andana.us/files/files/sibipoboxax.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/jorudedovibed.pdfIn PDF document text
    • http://maihome.hu/admin1/file/35450904009.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b1ca15f5---jimalemijexatedilobibe.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/o65bepgejk68l3nsqbks8d26f0/mofagumojaxofu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/4026116717.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/94378549119.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432ea9470f---masilusumuvav.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/79771831283.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/42981122566.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25166486a9---bapitizumozerujetoz.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/98234644086.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a906a15a8a4---kawipajedisuwetuwonisapij.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/zozogibulavev.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/30519109501.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160790583eaa7c---14487412909.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/xemonojubaxotugigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ginger+zee+agePDF 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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 9952 bytes
SHA-256: 7262a2a91e638ba3d30963348624375cf7b2fe9c2e3267e8cbe8fa1649d7f134
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 17900 bytes
SHA-256: 987e21efdc7ec1fb52af44176785859c8b8c8616c0f83b47bdd06270b9d55ba7