Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd41a4da2bd6aa44…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 20:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72f2f28d8949257cd27b4f7c264af4f9 SHA-1: ef61254025c6a7c2d19bb3588d9976239cb15ad2 SHA-256: fd41a4da2bd6aa44d1cd56ef9096b26210313eee88b0bbe89ebcdf317df1f194
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The sample leverages a link farm strategy, directing users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=how+to+connect+game+controller+to+android+tv PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ef0b1445468497ebea6069107dd5b9f/3736463240.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/talavemeso.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vezemirewoliloredifalagid.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/gululanesem.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/65066200023.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/lezafirinakuvom.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/54637074eae3fa566b223290f7805f85/beloxumadizup.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/fedolefazujirixibipikal.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b17ca1c34a2920697949f4e8210a9f44/17917493740.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/runup.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/87912561082.pdfIn PDF document text
    • http://vit-physio.de/file/kofuni.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/63382854833.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109111110194675.pdfIn PDF document text
    • http://ccadl.com/files/20210916225230.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bf036770eda2c3702289d84b520bdcb3/sejinuxiraruxo.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901173243.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/vemevibafowutikirilokawi.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wadasipo.pdfIn PDF document text
    • http://z500.si/files/pekebodowomivewovemupepaf.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389b08b0ef0---38807482262.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fovupisoriwawerawob.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/sesitalite.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8267cbad4---12276350585.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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 17152 bytes
SHA-256: ac72d22da57b7d96308c5766ca7e69d5eacbe7e47aa683f61282ab5260ff6e21
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 10688 bytes
SHA-256: 5348a6b670389486dd01cddc4e19ba5552cfda472dd756747f4b0823d5336ffd

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