Malicious PDF — malware analysis report

Static analysis result for SHA-256 4096f73f010c11ca…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 20:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0731b5fe8f9cf6645b8fabe0f0900314 SHA-1: 7ce5798d2ef38f2277e94331869d3f1c3985ba95 SHA-256: 4096f73f010c11cae6baa19470f5c7971405c2bc4b11f482ac1f117a959f2cc2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dongphat.net/upload/files/fijukoludajuk.pdf In PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wesigabiz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/55611910683.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4f0e6d6a---96222513982.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/49321365222.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xivuroratisogibesapadaj.pdfIn PDF document text
    • https://polaria.cz/images/file/dololonutilokusupozogavil.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51d7e614b---51302530340.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/visadegexoju.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f285b77e7---rawumikopek.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/jovivelegadebulewefugunu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8640651d87---depezirukixulodojegep.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/0ordji5mtuqead5npiq6ph49q5/74345081760.pdfIn PDF document text
    • https://promise-land.com/upload/file/87924291522.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/78920370158.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/62692eb8b6050f887f93ba941310b8db/83561746105.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/86527070565.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/sovezuzafonu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1624d2af014b0dcebb4d999ab802caa4/fodivosiwafunof.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16094499343799---27240649438.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/77409170764.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jufid.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/84898442987.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/42837579948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mean+median+mode+ungrouped+data+exercises+pdfPDF 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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 19016 bytes
SHA-256: 66366e0f89f4a9817f8a82c5c924a25e08ba6024be0e48c406ffdd94e691ae29
font_01_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 11112 bytes
SHA-256: 1776a2430710e57360fa8cd0d3506bd7e42a37f540f1c7d0c79ac81090fb8a2d

Open this report in the interactive analyzer, or submit your own file for analysis.