Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e617a93c52eec11…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 10:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16cab334c4684ccbb80d94cc815019b7 SHA-1: 5d433a3d2215acaeb08122bf9f7c3fbcb2ed4506 SHA-256: 3e617a93c52eec11b4f6c3dd382b281ebc83af0682c902e4b9520042236524e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8b479021---dawupakasikupuzogoruka.pdf, are likely part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134900117467---35311337757.pdf In PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/masusad.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/luvuw.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/bobinumimapapake.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/batavuxi.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/puvekupajufodalopiniganes.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/1243100971.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/37948727983.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/23279062821.pdfIn PDF document text
    • https://remini.hu/userfiles/file/zuxosubuzuzan.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/suwesevurar.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210903202244.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c93c2b9d9547c424dbbc3e0ce13f25df/kosekufawatiruw.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/87080225288.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/74225013992.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/35301672246.pdfIn PDF document text
    • http://fitviewer.com/files/file/lufegevolanab.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/25789397435.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/jalovom.pdfIn PDF document text
    • http://hkalc.com/userfiles/wanerofezi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8b479021---dawupakasikupuzogoruka.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/mezuzojaribamilupikewo.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/sidax.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/54137989140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ludo+supreme+gold+hack+apk+downloadPDF 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_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 11004 bytes
SHA-256: 1243c776639e7b9e5017b029323d6466004428a618ca16c2b162479906b6577b
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 17952 bytes
SHA-256: c23a3eec54350a8e98e7d2fd9f6e85ca4c7c4786a3524219fd97d6168bfe5592

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