Malicious PDF — malware analysis report

Static analysis result for SHA-256 e483d02a74358cd9…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 07:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5d2577d0eb3c0fc351b0b0c3fe24a23 SHA-1: 4ff53f38bd674dfbbd9e8c112fbe241f8f05cc6c SHA-256: e483d02a74358cd9a413ac3d83506a3dd5405bd467451a419b7426824a08efdd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised WordPress sites. The embedded URLs, such as http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9becbc147---bajafuwujitaxupofesu.pdf, are likely intended to distribute further malicious content or phish for credentials.

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 http://chongqinghaohong.com/upload/files/datowunosefoxipuluf.pdf In PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/90829537572.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/82097739111.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/75664873282.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41987424509.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/nudoboja.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/95345046646.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/demefivogufoladofovef.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nikti8l1cakhvaaq6vn369u9o6/91243711030.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/18487658157.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vuzisinalutigufegodil.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329ddea5faf---5545605730.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/deraw.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/lejimenasatamavoj.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9becbc147---bajafuwujitaxupofesu.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xulunawobojeluwatolafuwik.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xiximujuliseret.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/86867896674.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/31418882212.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/36981072477.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gunojuzawipotuzowotam.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/rejazabewofubunef.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sabotaputi.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/63589846894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+rebel+book+ram+jethmalani+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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 16200 bytes
SHA-256: bfcc53b8f37337a4d3689a351509803d0789555c0fa8e5d4084039be3805fa76
font_02_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10920 bytes
SHA-256: d0dcaa3fb340f4262cd4f6fb3d8bd674c8d265b9260b05d065fbfe543277694d

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