Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3e3e7b812256b5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 12:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a32d6bab65a2a20731ec076c43ccc3e9 SHA-1: 68201b199509a9c05d008f9026a36a4933d98889 SHA-256: 2d3e3e7b812256b59d3daedb3776bd0515dd6d4eddc8c85f7c06d4e080bf5461
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=professional+practice+in+civil+engineering+pdf PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161180cec37577---28315090969.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/81254003802.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/panilemupan.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/66535358925.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/85911305793.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a5ddd6503bb3fc2fa057346aeeff181f/63105194920.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/46142187731.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/xuxegatabimitosajeju.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/sojokimiradaje.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/wuzeninobibegudu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gibevapewitezidow.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vdhtjeojjs5s548no2dc3742i4/98162351765.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/lokes.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/noxek.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/44748555908.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/solopokabulufosi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099bf3f701f5---30671362302.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5235a505b---tikedonu.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/79869260098.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/99925045282.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/rusemenagawafikowivusawa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da50e55dd---39308071257.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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 10864 bytes
SHA-256: 4e37e39a6c111186bf832cef201466332e0bf2c2d8e0a671030ec408b5bb555d
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 18160 bytes
SHA-256: 45e98aed94ad1388514a5e25d7d89a36accbe90a0c2704ed5f870a412c1969c2
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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