Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1d25d9083154a4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 11:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53cce88986dd860383f6769b17c721c6 SHA-1: f15e0018029b916679d685d95d1407b987ac0bb2 SHA-256: 7d1d25d9083154a442c08afca583ad8360a56cd831f1c71f764c0667b61fe775
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it's designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://krisoc.ru/uplcv?utm_term=resident+evil+4+mobile+edition+2019 PDF link annotation
    • https://tourgardan.com/basefile/tourgardancom/files/jupajerirudidupage.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/dajix.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161336492204d8---notusijixepagabeka.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/62562298317.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909212942.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350919891ab---rotixozavorezomijodo.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/nibupalexalexudububu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/h4bjomujd7fpe68kl44o7vnlr6/pixodovizurasawijidugan.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/9681705719.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/wilotafux.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/91824758386.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a45bcf730a90ee0cf319315910667f7c/jiravoxorameduxowojig.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/rewupogepo.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/ledafuligolizenomoja.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0a1817371180459a2868a12e79d8e0c4/91540708802.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/91044295253.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c381be69---72704552309.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/runegezulir.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/dulotalodifeziro.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/63765652693.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/63645971405.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/15132079522.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/48459481891.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86854726d---11683858186.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/rinixek.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fonosuzagurafiwezofe.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///3302052959.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_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 19668 bytes
SHA-256: 02c9de8d03ffeabb0fe9ad726469e85af474417bc55ffef46afd36a79aef73cc
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 10936 bytes
SHA-256: 21fab33729f58caa7b8d9895d71d9dc9384ee1428d2befd393df03c791a271ff
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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