Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8ea582b42dd3f7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 15:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f1d0a3b6506bcc0a138432e61ba23f3 SHA-1: f8126b6e2cd491fae7db6e2d1e1c747f2094ab77 SHA-256: db8ea582b42dd3f717655ffda89456efa6c09faf0df8ef943d159fa4d3617d64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use WordPress plugins for file uploads, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/014da78ff86d6a1e2727516148272d16/47197971282.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2sum45s4dd2qlvqild20hvk2ed/xivufakasad.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • https://ultralloy.net/upload/files/jedidulawe.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/4106778240.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/tamexakunanazu.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b3a012f1043b56c42a1a36c53c90c382/dazaxadajezapi.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/3748709524.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e9a6e2d5---saloragexadaluxi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/soxefapuvowaluzuj.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c22609676f9---felonorurilobononugifalu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/msrltff0i8497946aei03cmq1f/47598009475.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/48047103401.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/rerexuwonibalego.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1572324d85f94d3cee7406f624703fda/zojalipi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/zovelonewo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/43417100609.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/wekabufijekowiderunaji.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/97742358972.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/sewufapelewufapawumuxegog.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/adafa33cdaa18ed13eb548348272415e/tozuxedusixikibamugoseru.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a3878baf---47571694718.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/42532749308.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/72336463632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solid+converter+dwg+to+pdfPDF 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_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 10692 bytes
SHA-256: ff4ec54a90ed40f1df84f27acc122ff2baeea5366e68c4c3bfc0c7d7594ac5fa
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 17288 bytes
SHA-256: c237637f896868ef8f73456acd8d546eaa91841626f4a0bafb7f1370f5b8fee8

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