Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bda5a85514d9f3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-06 01:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 31f0dbf0c0e7fe50e727365fa934e1c9 SHA-1: ef3339d1393041d754d1e451616d275f3e09bf56 SHA-256: 65bda5a85514d9f3c16190a5520a9db807d4fc5972933001bb7e1b2810554e68
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as a phishing lure, likely using an image-based screenshot to conceal clickable links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads, designed to redirect users to potentially malicious content. Although no scripts were explicitly extracted, the structure and numerous external URLs suggest an attempt to lead users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d703247d1---82540271491.pdf In PDF document text
    • https://cmsschoolkg.org/userfiles/file/mesejezaniwuwonedasosike.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/4086387656.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1874091978609a57384fd9a.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349528bbfa---pefodi.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/57816140292.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb902caa1---74352017083.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/xabateranusebirasuz.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/sojowatagevapuvexaba.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/89098500075.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/vuluvedozonufuworuzelib.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1e44ae8106a3f8edc180a97522fd7ab4/xanotex.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/kutakuxavafoviwijulek.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210603173257.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a727caaa---fubilajumakixu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jazesudebatovebemilegiw.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/17306956792.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/7904119815.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/ravenikuxatogepej.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/zibinuzoxakibivuvud.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/pupuve.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/27775679931.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/sarizubagemibud.pdfIn PDF document text
    • http://beiks.info/public/file/togixorofusovinegojogon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=all+derivations+in+physics+class+12+cbse+pdf+with+answersPDF 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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 11276 bytes
SHA-256: e245b12ec78550dd25c2a33a4accbb8733e04dd296f0462712418bc37e5e6152
font_01_sfnt_off0000cdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 13824 bytes
SHA-256: 3c6e73d4babe682ad023409121614687b2f27ae4d7b8959f003b59bf7c12d966
font_02_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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