Malicious PDF — malware analysis report

Static analysis result for SHA-256 545dff9f82f5f58f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 21:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eed9b2f2695597a1d0e5835895d25df8 SHA-1: 6a542e57b62250ea0d5fabf98e9f73a7f2b52fa9 SHA-256: 545dff9f82f5f58f4421bad764a636e1ab905514f407751d09abea4d2ec0c90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, particularly those hosted on compromised sites, are key indicators of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/catsia2eme882cgivg48133or2/9923543114.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4a9b8242841cf9cd4b0889f185125019/dowavunufe.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/diwosorigusasebobaw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fovadunu.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/20976256176.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608470edeb9a9---vefimedanivaf.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d223ac85b77803e9a4c6b0f717ba22f2/seminutatu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/203bf899cab1a0d3b2cf7d3a181345f9/81623287163.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/kusorixezuluzaxibofilax.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/27957437816.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464ca09abe---72727002052.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/66039023163.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609233752f501---59957523735.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/74102151127.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/62725527776.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcbdb3e252---98345110332.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/31319991459.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/nusazimikinubaferupe.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/bobitivosofukodom.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160846da7b0441---zogavet.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/81194650112.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608261ed63a3a---71013192481.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/81858526664.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79557469613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=medical+records+transfer+form+templatePDF 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_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 10772 bytes
SHA-256: c4e509e14c72fc15f4d87aaf8483934aca1693d206c8ffc8485e5a4ca683870f
font_01_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 16928 bytes
SHA-256: ff10189d9c18ebf9fce086b2b7b8db8eaaa86e8f207b062acb43b31fe954564f
font_02_sfnt_off000140e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1