Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7edec69cd73eed…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 21:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c049403885b109ed8be49d5fa816e298 SHA-1: e8b6b07ae2199e860045c35b942bc256b68704f6 SHA-256: 6d7edec69cd73eedc3d2a0e2fd4e8f799babdbd4d4703b7b3dc75d369dfc766b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://saringkarnwood.com/UserFiles/file/kalisupexotebenanur.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f36dd7a2---baperadewataxasigowode.pdfIn PDF document text
    • http://centronegozi.com/public/92772579621.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dbaba6f600923cb21f4775bb7c967421/najelexofa.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///rudefekarifa.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/nalelutegovufebegepozoram.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/tujosanip.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/93220899665.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db6df3768---tijupowezikosokomegamil.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378740d8385---fezisiwewatoku.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5ef99976f4b7c3f40f972f908f324eb3/bivizug.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/30015160224.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/58993116369.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/64810790446.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xoxagetabik.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/paridejafa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91ccb33aa---xowekavinif.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/zaguvasuz.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/86843869367.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zafedupalanativukupufitu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/watozibakazar.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mikegumoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hack+real+racing+3+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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 10532 bytes
SHA-256: abc30d1bdaf5983173bbec194ccbdcf8641bec9c87c41e7f041456567828ca6d
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 18896 bytes
SHA-256: ff1ae37f9040b5c3c3d57b386c1c0e6adaf053f374d6f8e51a5b6d56db505e78

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