Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d23d72fe5fd30b5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 13:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 959d1ea2d8cb8c2e2efe19e0cd0864d2 SHA-1: 2e06b2cf886bba4a5794f6b8cf7fb7c489754fb7 SHA-256: 7d23d72fe5fd30b5465d48937d0286a1f9625397fbb677b4b15c362a35b4e92e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL findings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=cleaner+xiaomi+apk PDF link annotation
    • https://morethancars.eu/uploads/edytor/file/44304753564.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/35785697339.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/weris.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/xifomuzipekij.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/betexatuzamosobuka.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/77336732025.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/69615748525.pdfIn PDF document text
    • http://chinalabware.net/d/files/28462810311.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/95lcp5jo6hoj7egqq3558qe797/bisumexewezugeb.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050959367590.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/79395285916.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35b24048e---zipenolozajan.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rositeforamuvemumuje.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/67055741572.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/vosusupatidof.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210913_C6869DA21E8062F0.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/6319248355.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/difudopujekitofovoj.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0eee57af62cc93b1cb8b06a67ce4bb9b/81264466504.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/66343526708.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/manogagipafup.pdfIn PDF document text
    • http://jiab.net/userData/board/file/sikepexezazaworipi.pdfIn PDF document text
    • https://fultoys.com/userfiles/xofusazilov.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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 18564 bytes
SHA-256: b59e099cad355f93ceb9aa66a36ba044ac8a43577f09f18256d87217ed0f6b14
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10372 bytes
SHA-256: 5b4f7365d7cfdcd2f223c381ec0e6f0833bacf36cafec96f821992ffeef9d12d
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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