Malicious PDF — malware analysis report

Static analysis result for SHA-256 efee9a4b290db74b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 17:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3890eb4816c8062f47fdb6fb4fca8ea1 SHA-1: 761af15a12638c6a73e27b59eb877893e84c2734 SHA-256: efee9a4b290db74bc3aa70aa7ff2a29ee07b9575f1f94dc9c31be103131e3c92
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple disposable domains and compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=play+store+not+on+my+phone PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac04e01a7d---wesogovakivad.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/zajofuvumupiruxonupekob.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/48983524430.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/roxugorazezumivezeni.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1897708977614698ee74914.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/42062454030.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/14849676336.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/niterevikododugejo.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22635183344.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9212425990.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/47987117570.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/31593030304.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e692c3ab57246a2167e9cf68f1cb6011/84569178855.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84975956216.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xufepozibuke.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/80549207494.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/luposadomejor.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/jumegakejemasesoporo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/94qchu3guu77lru3f841qvlv9t/44193881159.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/jafijukitipaxiw.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9980e58---62669739880.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/43116609691.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/41432120964.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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10540 bytes
SHA-256: f8ff19f82e4f19a1e007a7077f2b757910afd33325b80465063108b985d3cd6f
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 17920 bytes
SHA-256: 6f3b7bec5ac000e406dafeb07af06f37a252c437d5ba5fd2fd664b98a38f00d8
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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