Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bf0872e178b94d…

MALICIOUS

PDF

120.3 KB Created: 2021-09-06 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4368954b24bb5fb5ac690c3159fb2259 SHA-1: 71b4936a0bfbf3d810ae95548cfd16084eeb702f SHA-256: b5bf0872e178b94db3f2778127cd0b89d9955c6d1b2bd0f3cbda31712330e08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/oe1j2phprdcf60291nr0666ktp/nawogelijo.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/edc8d924c61eced0c5cb669216a99bb9/wobarajunomavemerexenel.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/676bc2e1df1db99c916510dbd39c8859/1281665081.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9f08cc5fc---91138838651.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf55a05d8---mavakijawijirigikerekimo.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/12690851940.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/fonane.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/20734220524.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/718447f11163b11ad7d96c285397e955/vuwaputisexorig.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/61e7e4c7871b6729323b51f9279fdfee/gabamapabaxibovev.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/wotojolimonaxujoguvukubox.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/sarukiketazajusume.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/katawaxuvejuxiwud.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/desojutitunukezagobim.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaa1d79b3b---78101703951.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/ziponazigunisajitiga.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/migizidunolawovud.pdfIn PDF document text
    • https://t2sc.me/userfiles/suduxusujusasuwamifeze.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bezutox.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160808474849e4---xamosopisofawon.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/635a26fb3f5d26cc5774a405571d080c/sojeguxif.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b8b888c7ab6057dd7ea069056a4dc316/lufofavuta.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/45757776253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=waves+soundgrid+extreme+server+manualPDF 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_off0001726f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1726F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A81 18300 bytes
SHA-256: f03085a7f30cf7644f228c53482bba04949f704dc8bbfad46e9af81c67bfa59f
font_02_sfnt_off0001ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA56 10852 bytes
SHA-256: f3f1c5277411de92cb739546bb13f5ee992adbb1d8489f0c89bf5ae804ae7463

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