Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c6004d840ba95d…

MALICIOUS

PDF

93.0 KB Created: 2021-08-17 07:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e72f5b3715d4bc3ef6757918141fb5e4 SHA-1: 5fcb1e170b91c385abcb4f7e57cda400aca49aaf SHA-256: 88c6004d840ba95de738165a11a67da355031e386ea636060f13dc35dba5541b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links are likely used for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=which+one+of+us+is+lying PDF link annotation
    • https://itracmediav5.com/ckfinder/userfiles/files/vudejujurukagexafevisoji.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/48045009696.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/79008710404.pdfIn PDF document text
    • https://italvaping.com/file/lopodenapulunimabax.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/60212403137.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59065b56c---82047463197.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdcb5de0a6---80780138425.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611493e44512c---bemasepebilezugolilewarug.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ea6826b3---8092169681.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1f57c64c887dc9883ee7248af857/vewunojoduro.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/31148611393.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1611b27268ed8e---lekevarubifetagewiranu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41152506644.pdfIn PDF document text
    • http://artside.org/data/temp/file/35124151328.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607efee25332f---wadafajag.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/jewebija.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/45126958727.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/52120527790.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/bufesidabolaziximibexos.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/48800588807.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/dujem.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/balabezaboletazov.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/70d958e817e198faa4b4fa130f120d8d/bumav.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/03258c88ac69ccd5eb7d5a378a1fbc19/42113623475.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 19024 bytes
SHA-256: 0badc9c51f1f6b02a28204471cb4c0431ce8f450cb18e3f1b0c6156a8b964344
font_01_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000133be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD5 10460 bytes
SHA-256: b669d31e8d8a3d27a6b0ad8ef9692a24253540706532694c0565841166fcdb6e

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