Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d3ba3bd80be9a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-24 01:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dc6dbe850d9d079d78f43b8963267b1 SHA-1: 11f00a0bafc488d6dbb4bc74d43329b6e7c3300a SHA-256: a37d3ba3bd80be9af5dea31d8811b4f1fb2e245764ae0ff5b0d1687d57fa343c
156 Risk Score

Malware Insights

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

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 multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rosanaalvarracin.com/userfiles/file/61232615762.pdf In PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/patevigubatozim.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/forawubunu.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/99258600535.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109101044099444.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/fotizebawurazibu.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/vawiwodoje.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/g1urmvu9g1j36ui3i201c2rvai/vivul.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/tonugimubowutegotu.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/jigedobumuxozuxapobov.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/40935332272.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210903_3AB91CB7CECE1016.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/zeburikoforez.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n1f31o6ssaot48tbdbve3fhl3q/goliwodajonovapavarat.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/74412662255.pdfIn PDF document text
    • http://flirdining.com/uploads/files/guretugimoderawalaririzu.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/62185474753.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jolarugikegolifap.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/sifojeluxirit.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/35694252657.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/43575913918.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dddd8022f8---begowezozeti.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/83777815806.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/36298921831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=deep+space+waifu+apk+androidPDF 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_off0000c21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21E 16804 bytes
SHA-256: 96597a19fa5709d6daa99bcd067c1390ef05080e88c0fd448c515abc8df90a0d
font_01_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10748 bytes
SHA-256: d7b61703b8aae212cf18723c8670b0426fbc5d4bd68a4708d3d2332bd631b1a5
font_02_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1