Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da4350463c6b03…

MALICIOUS

PDF

80.4 KB Created: 2021-08-08 13:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f022c56d58088e496a73e2845bf6dc7 SHA-1: fad6d02dc9631bf53b082a6138b525ae62b336ab SHA-256: 92da4350463c6b03190dd213899412184490b915ee2de2bc1cdd6f850305bae6
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button heuristic further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 http://hagelkonzept.com/userfiles/file/84419371460.pdf In PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/40879936194.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/difetuzuborekibipukurox.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b5facfb4e8f67c5aeecb0e9dafa4ea68/xewitazurosododev.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/45769891901.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/28a9f45420a9cdb9b7715090fdfc6b69/rubozusozov.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f68eecf---65453956543.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/kopopewofezetawudexu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/76965821294.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4a944938---belopadafegokuzuvadosoto.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/wivikapagevemabelikapo.pdfIn PDF document text
    • https://cooperspick.com/files/64957397982.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tefumevotejegejes.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/35739366459.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aff4d151aca---fulikumatu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k28qu6dn55rjm8rqq2rqrjqvgc/13062075005.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/lakuwutumadapus.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb30167fe7---28545126855.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8eaf9e131---xarobufopokumuruzejeti.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/11623894302.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/81264598848.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/99150374942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=reading+comprehension+exercises+simple+present+tensePDF 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 16840 bytes
SHA-256: 76377a770b1ab3502e14d1075ad4764b3c4925251fb863cc0f97744bcad7f091
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 11108 bytes
SHA-256: 47d2d84965e51b50102d328305951820d25e3b0f873e14b9f7b4209cec19df64
font_02_sfnt_off00011bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1