Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ce734db331a0b0…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb7e4ca11b29dbc3e72c218efea28930 SHA-1: d697aa1191b123602ea824c4f305bef55aa86f3a SHA-256: a7ce734db331a0b002f3f8e0c1cf8d21f8aed6a90df31c517799b2918d27ff95
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=como+ocultar+la+barra+de+navegacion+en+android PDF link annotation
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/93eba9e7fe412a4c35c3d62a17f28fcd/84486336130.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/wirezugozedowufarigipeza.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/jevugizifotasal.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/zekategekikagujipobavu.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/90615017789.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/vawogotuganalesubadonise.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/79192679082.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/17569528189.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/sofixadutodaveluxabesadad.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16135264ab5e1d---1139926188.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_015747.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pewumera.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/kerinakeramojanubod.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e3ac0043---81136326516.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9o2albca6jl4q7143inb87gj0g/losafakuxag.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/58668103271.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/45465220260.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/71945676354.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73169e045---kasobuwutabujimuzikav.pdfIn PDF document text
    • http://progetec.org/userfiles/files/tojusuj.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/juluwa.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7b7f5d589921783ee744c41d5ee1aa9f/lejabupusuzuxa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/bumixoguvatubabep.pdfIn PDF document text
    • http://letdentalab.com/img/files/77519438808.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/semagufe.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/14403372536.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/wizizamelifilek.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_off0000b9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DA 17456 bytes
SHA-256: bd5e6a16b727e880029949cdc06a391ff803d54b6e1cbccc8301e2a3bf8c572f
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 10884 bytes
SHA-256: 9cf935d36b8b1b816ce317d661da2f7938b5a788bfa77b35ea09561d94807a89
font_02_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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