Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23078ccd00a829c…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 03:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 318bf906e9318a05fd5b15b7b4e84770 SHA-1: f727e2b131ba27d8e53199a049d3c829efa904d0 SHA-256: d23078ccd00a829c5ff8d234c7fd56f94bea85b4652ea252dce16e77367bdc2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. Heuristics indicate these links are likely used to redirect users, with ClamAV and ML classifiers flagging the PDF as malicious and phishing-related. The presence of multiple external URIs and a link farm suggests an attempt to lure users to external resources, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosenixezeta.pdf In PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/rikepeposiruxubafi.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/suzelimozajetuv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b52831be13---fowuliwowubed.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/korivodogas.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/zafodaxuzetirikebeb.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afb2ca4605---memepetifa.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/89735913877.pdfIn PDF document text
    • https://0908108108.tw/upfile/files/2021/09/29/renex.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/32123629494.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/madixili.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/zabutasujekas.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20211001174655.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145efbf20f5d---33439181754.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/10872766915.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161345717e3ac2---vexefawafi.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/14645999722.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/32710430803.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/mozuxumufabulegamejik.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/gepovimaxifij.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161540c943089c---zeriludexarit.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/70377067001.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/fezoda.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/welekidawuluresu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dolphin+wiimote+pointerPDF 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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 10276 bytes
SHA-256: 16da755f4cedbeb73db584ad1f6acb7a9c62372767a6ebe1c6a488bc981a45f3
font_01_sfnt_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 14836 bytes
SHA-256: 48950e58699d27c800c01ffec959388e5cc70ff7851d3fd8c3446e4fb6ec6bf7
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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