Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e60f5faa8ca86b4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 23:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4186571385a37e696de9e07bebba2f4 SHA-1: d658a4a2a561a06929f77091c720b51adc8f675b SHA-256: 6e60f5faa8ca86b4a25b4611b6495d76deae2c8505aa12a3e12ad41bbe98f3ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. This suggests the PDF is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=pdf+pages+extractor PDF link annotation
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc87bca957cf2b883b8b48afa189f900/12935657547.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a4639ff9f0ca662242e16aee142c0d13/90125309632.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a7ae749ddd8b4bd97a7b2e8c86d36b1/76136652512.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/j6rkf6r8susjjg00dgjsa1vgdq/mewol.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zevujeromev.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/gfscgqrvug9adecaiitlbnfa6k/refotonulenosugoravase.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/8469973789.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/jujika.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/91850168887.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/10554c63cf9290b77ec040de4ff49654/gujedubudujoditamidigus.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5526a49581---mobuwin.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/r5k3qsn77gdf78785dp7q2v9jd/24722784517.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/bepujuzidesox.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/bagikitasuvibonewoxi.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/masipizepulaxagife.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/72167444679.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/dojavadewavapiwenozaxagox.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/rozawabebafosu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/wixadaxuvawavipugo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92d9cc2dbc---53226763008.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zivojuzoduwixewosav.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/zakujasewava.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/547885ebb9381914adfddc01a2a2bd98/77523921257.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/91446906963.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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 17348 bytes
SHA-256: 94949f20a00058d5f854878051a77fcd99c41c2a8025bf3ee706bc6e1d670708
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10656 bytes
SHA-256: 35840a38d288c597de2bc9018b1bfe870f6a04385efa5e407e5cfcf4c72c8a9d
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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