Malicious PDF — malware analysis report

Static analysis result for SHA-256 981648d4e5fd9c54…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 11:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ad6f7d524345379c0c7fa5b152f016b SHA-1: 9f40dc867e97e3b793d244cdb422096651b1d1d7 SHA-256: 981648d4e5fd9c54342078ac2b1178e8777f84c15fec55ffc85b7cff3a8f678c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=how+do+i+use+video+on+my+phone PDF link annotation
    • http://dhleisure.com/ckupload/files/42988515010.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/79286917715.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fofet.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee257d9679---33447872986.pdfIn PDF document text
    • https://wrd13.com/force/file/31368693420.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/guvuxetajobogulomarunedug.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613996c0476d2---jozenekad.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/pj902cjk0aqd6029ctujfb0kdd/madufomojaruv.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/78948458046.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7fd51bee7b1fdc836db8fa259690dbb1/2506486695.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/58648478750.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/33556617419.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/gamavur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abd5a479b---zopovujuw.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109131906118239.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/77614785289.pdfIn PDF document text
    • http://schubert-hh.de/image/file/pisatutisakikiza.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/23674215502.pdfIn PDF document text
    • https://paradigma.bg/uf/file/87555633357.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/darovinituduvufuri.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/sinarubegorijilibux.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hged44u5vdhsgvnf6pmru8ku00/3288601705.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c686805d46---xamepisovufiwesumibolofo.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/xulotugitizebepuku.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_off0000b5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A2 10608 bytes
SHA-256: b8b211aabde5e356502f8185541cb15f35fec0bb63adb54f6b7219b1569c5e7b
font_01_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 15336 bytes
SHA-256: e33e0c92788886063f9ede33b2e0ec15f94ed5431cef02d5d95854e262a8fcd4

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