Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b88f3ab7a7f378…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 10:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5824486483853710276974851ec96a50 SHA-1: f03d2f7efed422031940fa1df07f42e7fca7b9c9 SHA-256: 26b88f3ab7a7f3784ac6b3a4bcfd89bdbf056063ce144d1de8f65199a8594792
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

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 https://bokaichenyu.com/upload/files/11330118754.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161436628aa6d9---55018739311.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335dcc80892---pepinasal.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/15697223394.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210831233823.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/jelowo.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/pevosixironewigekezuputo.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/36710529529.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c80bc6c6a---dabilavusojoluworimijog.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/60447805855.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/67313816660.pdfIn PDF document text
    • https://o-dance.com/upload/files/gabarudibigu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/mifekiwe.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/32122809615.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/mimov.pdfIn PDF document text
    • https://value.ae/userfiles/file/zekexaga.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/86766462660.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/25448816621.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/webirelajujeduzor.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/butujilegokepu.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/12131848020.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/mapiketeziweropud.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fawazisi.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/gajelomomixisemanurevige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=elite+dangerous+massacre+missionsPDF 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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 16780 bytes
SHA-256: b7eebaeef7643edc6d69664acc2aec975688446fc80a54c4f520798843297ae6
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10796 bytes
SHA-256: 0810640802fb53896fb6bec0d1f45a0885bafc8f436246bc5debc50953960e7f
font_02_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.