Malicious PDF — malware analysis report

Static analysis result for SHA-256 7785855629586ca8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 03:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52a641dd22c8aa0a13175e7b33f90a55 SHA-1: 25a7f172cf00e325d2e96c31eb9cef92cc1746f1 SHA-256: 7785855629586ca8c2ddf52eecaf5e17c5082f1661ef58874a594197fce71813
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. The presence of multiple links to disposable hosting and the use of 'utm_term' parameters suggest a phishing or malware distribution campaign designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/een6jdjmo35gnm2e55ttpei0kt/98593700987.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/japn3h9i6kgnvrfg5kbb0f0173/teganif.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611f84fa8aa45---42145760038.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ffb2cf6fb8b7cf372dcea3c913dca637/muzejimaratibofasejuxuxe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/77c5de8dfd09859733472896f9a86bab/zaxewifopigi.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/52106685225.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094600a233e2---boxufozuluwaxeja.pdfIn PDF document text
    • http://stringladies.cz/userfiles/46806117683.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/54437258057.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/79665285343.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/79712122959.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/xesivejav.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/94802361448.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3d699a47---10486661385.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/dulevukugelakokekidenebek.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/duwizopok.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/h9kdfa9238f5uluimr57lssdk5/15960130840.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/aec957a51f1e36d501529677d8f682e0/dobaxupupudoxigolovile.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/84565670113.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/21866043615.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/jowerewerejademuxepi.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/maxawozaperekudigamesiz.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/f2jfbqkou1fqjecnrcb6atqurd/6115726241.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aee2af95b---49644281056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=foxit+reader+rotate+pdf+permanentlyPDF 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 17264 bytes
SHA-256: a1063c92567061d1d2033ccc02b5bbd31d042b412cf159e99a2d3a232046de57
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 10684 bytes
SHA-256: 9c52faa91d67cfd68c362be3737e67af4b6b66c89441bf37aa3d6e4fc08a79e4