Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d9d2eec6cef523…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 22:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e0190e51a1fc51795d67f1ee493f8fe SHA-1: c2d0e29e514fc085334fa7e2dcff7c1804528584 SHA-256: b3d9d2eec6cef52353d234bbe747d6da82875d25398f68acad0b2f19f36b22ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded links point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://x-site.by/upload/editor/files/69032434141.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/91489135113.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1096921084608a562b445e2.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/91168450547.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/22442343335.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/64119353241.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ed406337---95150429799.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fe3117591---dimenexenukapileva.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a490348b04e---50322734283.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/32397842875.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/10021177228.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8f6cb19c880e79199f3da93b77f48516/pekozetafajogupenetevuvaz.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/71257752696.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/21349808316.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021542232483551.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4163160fd049bff317dcdc1ca7f5397a/pegikerogaludo.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/9467686115.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/23110348838.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bogevuwezalojawe.pdfIn PDF document text
    • https://servauto.fr/img/user/file/45385735991.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/19029742569.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9927c3fb85083b9420dd304efae8ca32/tofelukajifetogaxofiwoz.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1ff7492038d9b2f761884943020936e7/kilugokesuwomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=comptia+security%2B+sy0-501+pdf+freePDF 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_off0000bfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 11216 bytes
SHA-256: 0233fdc836761b99c71b07286fd30b88189d8b4092fd209d75d05ccd515b3041
font_02_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 17132 bytes
SHA-256: 3ac7e8ba7fd6b1b4bec25292b7ad006cf880d495e5c80b4440d5de8acc724aaf

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