Malicious PDF — malware analysis report

Static analysis result for SHA-256 72652675e383443e…

MALICIOUS

PDF

91.3 KB Created: 2021-07-25 19:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83fcdec4c195d050ad980e9dae68e513 SHA-1: 593055df3d393adea44396c323c62d9f0c9d7b18 SHA-256: 72652675e383443e432bd94824cbcb8b6e526abd5a0c50792285bb57cb531743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ccspevents.com/clients/24998/File/sizidotisude.pdf In PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210704154709.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/69205906240.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8368ddb40---989144600.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/5960253536.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210721_CFE3BA38CF2B2A89.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2f34833c---60472788302.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c1d169163ac6f22707458439de149841/bazafejudisedufawaf.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a271cfa8a5b746196f7fab2bd19f5d48/zadedimibotelizifezipilup.pdfIn PDF document text
    • https://superchills.com/userfiles/file/vorimudizature.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080262ef43---fewuvamezaj.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/jalogode.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/noxojatej.pdfIn PDF document text
    • http://ruresept.ru/files/file/21942331551.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dae3486a7---76970149707.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6cd9f62d6084b425e77c3c2fab33cfa2/ganivewuvowizuwomixijenu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/gepigexobiwezam.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1c5465d67---90454353134.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcc70d3d66---87846495706.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/38209750665.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d637864---74962710720.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/poforububiwirut.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607d285de48aa---rukelipubipi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091194049bd2---wilulukizamevenulabunawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=st+john%27s+apostolic+faith+mission+church+logoPDF 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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 16632 bytes
SHA-256: bc4784457c7e509362ca62046872b5a48e778f43bbc44d5bb57b358fe7bb5f63
font_02_sfnt_off0001460b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460B 11136 bytes
SHA-256: a30a2144c600cecd1df72d0b86c3f814350dbeb570b461c5f4e6daa4a10750d3

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