Malicious PDF — malware analysis report

Static analysis result for SHA-256 44da7c41b4f43cbb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 12:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c3aef8e6f917e424b3c583478f472e9 SHA-1: 26174be6d774fc2f7b00c95c4f355de274c5fc08 SHA-256: 44da7c41b4f43cbbcbe3648ec404d45d7082b0d34044a3608afacddefd7e865d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the presence of external links and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/7dfdc248ed3d9e2201b03244cdf4a737/kajonorexuwinu.pdf In PDF document text
    • http://komodovo.ru/upload_picture/ropogas.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/wapetakofe.pdfIn PDF document text
    • https://preciseenergygroup.com/media/71627754227.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/82328508950.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/36340252969.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/vujopabojona.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/55261751395.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/tuvowi.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/lesiguwawujokipumu.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/dizejumewakoxoloweraf.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/golobu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d1dcc817c856a84288d3d04a9f42e82c/murokugibepilapetu.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/ginukaguxovujikulifepe.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/texegutoxidowutu.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/3263747214.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/sulet.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3a28b8c2534f068d5ded8fbe4bcf7e6b/22410177529.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/pesodokizepesilit.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/noripudadelovo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391a8944442---banokibesi.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/zulokinugiluvulalufov.pdfIn PDF document text
    • https://ahha.az/userfiles/file/tedavikunagepapunux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adblocker+extension+chromePDF 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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 17444 bytes
SHA-256: b23f9c02679f74582d01b33f210cf4548b586a0f9efe67b82ef8b05a0f6cea85
font_01_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 10788 bytes
SHA-256: caf2b8ef80f92fdfc6748616ecddfb2a40b1ed9a2bf5ff049390a9b371c9e62e

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