Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a82284574808d9d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 20:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 554a5f9d0a042bcd26951f5efdad5d4f SHA-1: d71db18b91a8418af0ca4646c643309e4b423425 SHA-256: 5a82284574808d9d41c43e578cee838529ef30b1097384096b4f927de7ef33ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. Embedded JavaScript streams are also present, suggesting potential for further exploitation or redirection. The primary attack pattern involves luring users to these external sites, which are likely used for phishing or distributing additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/27a35nockb1acfisge47di8uod/wawejakukarunugu.pdf In PDF document text
    • http://tlxzkj.com/uploads/file/220740344779.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07c107e9b---dilutubetisorijiso.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/pamina.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xiduzanedegijepozufexonob.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/67766345439.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/64166451890.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/pawotiborijewosufemago.pdfIn PDF document text
    • http://halmar.info/userfiles/file/tikunegerinigoboxusu.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/31693824868.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/duzepexizajurifuririg.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/lusedejobiwidanedob.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/velajosirefuwulorelokovaz.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/topuvolujixofuv.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/34410318491.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160eddb9a32aa6---81349012386.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/57067075950.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wogerotizob.pdfIn PDF document text
    • https://12shio4.com/contents/files/35911043539.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130df455a6ea---41458014577.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b22dc326b---wetudeb.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/wejejoluso.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/nuvudubomiwirobuzomepages.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768ada09a9a---legomuk.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad396ad368e---tesizejefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wh+questions+present+simple+and+present+continuous+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_off0000c225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 11224 bytes
SHA-256: 7124fcc927f6efca747a62b49ea83640d48a53e2badd0e1c9bf72ff3f2175155
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 18040 bytes
SHA-256: 29dd2433eb8c33959d613d516bf2a6d0287797ec89946293e94f6c32125a73d6
font_02_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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