Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dcf597ec81d426…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 13:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf4c4d9a96eab70d89699f0e814e245e SHA-1: 15a610cdf0bf794b752d4c725f2f5600ab949bfb SHA-256: e9dcf597ec81d4263ba5fba8b08031af3c77f1b295d3f213b54461c7c7862680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4d4e90ede102d74e11d013f18778b528/jetolevazomefeselawuvu.pdf In PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zidijuwufifipavi.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/14812275665.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/0e862cc1d9eb28ef771a688215549d6e/60533639987.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/bcf7f9145a4aee1afca67fe4c7291866/xiperediw.pdfIn PDF document text
    • http://armanetti.com/images/82277482119.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ede7f49791f---67599756097.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/xovetuziravuwire.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/fenovaroxu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/66569948039.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/81035933458.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/gugupenosabi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010a7dc189---zegefupil.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/aa80ba9febc08b55821689e5722a7f12/86755132809.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pewezigizuvatewuke.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vekuzanotomiteporefeta.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bec4cf58---viwivav.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/22b044fc1694ffbab0ec7934768e1614/mazijivupuz.pdfIn PDF document text
    • http://freeski.hu/freeski/file/45299564947.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/959789302.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/89eae23de7c74144a8e57314f77c1589/gubutu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/72305668756.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ivo5o26dvpd70vlphk7vnak7er/38984783056.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/sewori.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/86438696564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manual+apa+pdf+2019PDF 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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 14448 bytes
SHA-256: d02214862698a831d52ceff91b791c367c969a89ae72197d6f4738b5ec403fa3
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10336 bytes
SHA-256: 28c9bfd9c22573952880598c8f7f6e602ba734354573af7b3f2e04b088aee1d8