Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e17e351741318b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 19:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1571f4405aadcbe9df82587a2e85f6b6 SHA-1: 344f3d01be9a974503eadbbfcc1810bfcbc4aef8 SHA-256: b9e17e351741318bb49eec93cb59a33b0c7f3d350103858590e5ddf7f1a567ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=english+worksheet+for+lkg+class PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fffee0dd---92727251755.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0qassh1blj2h3vpqdcooje2fpo/80323155912.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8961ecb96---tuwawabimuxuxixav.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/zixipujugit.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/67064614706.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nafuw.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/89223691787.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210708141633123.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/31524121694.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/12030167296.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/70204490284.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626095309.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kusanojepa.pdfIn PDF document text
    • http://vkts.se/userfiles/file/midajivovosixile.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sn9jk5edp5bmhlspm6hvqfdgcv/sejikagojufutasep.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160787a2e3e9ac---7044650083.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210622223235711387ns7v7vgk2442.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/90044062506.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/965589377.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mjqfkd6e1ui9aq8hl87fc49ger/rufoperovafo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/77826369840.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf508c4a76---95474156534.pdfIn PDF document text
    • http://myslizdrave.com/soubory/nazekivajadilubip.pdfIn PDF document text
    • http://sushi-belovo.ru/files/jisiz.pdfIn PDF document text
    • 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_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 10776 bytes
SHA-256: f7bd6040d05b533cf1e2a2a418ac9af08153e2acfff6e3c1575bb3368a454bd4
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 18156 bytes
SHA-256: 00ababa7fede4ab125848b030ce089878cf15b6b7811fc3646c57eb720b13147
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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