Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd927bedaede58fb…

MALICIOUS

PDF

87.5 KB Created: 2021-09-21 08:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f7313c05967ddeab485974517b27bff SHA-1: a0d65fc1c403a04407a200652bd2f25dbd4c9361 SHA-256: dd927bedaede58fb2c5bb834c6d248e9b0ec4d65a4a03d84b85ad081cc13a9cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://inwebjor.ru/uplcv?utm_term=android+second+activity PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff925c610---84516670647.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/38245603436.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3b9c1c22cdfa9f1e812e965aadf2ef3b/3520686458.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/68052462240.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210910_124725.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/raliterifag.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/28177611166.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/rizubav.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7cccbea3fa483b81e4fbc7ce9714257b/39916030665.pdfIn PDF document text
    • http://turnyras.lt/Files/file/9711025243.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/zivipojalopobowolepukesan.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nutiwaragobakurujadives.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/14109668269.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/surexijutebewepexemovo.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/55065738967.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/66169187469.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/gewunisubujabagukup.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133481eced6e---vikedumup.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2ab82d4f---12189138661.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/53061467039.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614338717bb19---pitamepafubufixu.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/75868789625.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/mugugaveporilubawoz.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/fifomasu.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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 18024 bytes
SHA-256: d31a4d08adc84549fd1241f2be4a1ae7ada74a9e124ed0c5ee158160e3dcf415
font_01_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 10476 bytes
SHA-256: 7e3d34842ce3cb7f2acff99834555cfa2329db31774516d0dd4837c1912de60e

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