Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0957a2c80cfc294…

MALICIOUS

PDF

123.6 KB Created: 2021-07-13 19:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dbd0f385f2e06ae47ab8d04a6f97bbcc SHA-1: 66e72444f57d1dd0a65b46cd46092815737e6bf9 SHA-256: e0957a2c80cfc294e0bac72c9950b9d27446c60219ebc549b68fc92412488df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=the+entrance+of+thy+word PDF link annotation
    • http://zuche0551.com/upload/file/kanemegok.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/kopubufefivefexobadab.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/24dcb5bfd8df8f25983c80e7fd7217f7/sokuteluvog.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/74797140338.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090931271e2c---zuxezajuvafutavuzatuz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9cd4b028e---25726451974.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f56660fcbfd10b3394c686a34a1f6406/davevipupe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5202a35153---faguvuxufumujajepuzafa.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/82037462353.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/15474665217.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fezofepuw.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/levirotaxiwokozas.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/wegiwonufunidufarox.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086db78926b3---42165899350.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kosofexiparonuwogegun.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4348dff8a---33458366212.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sowosemurovoduxezunanogu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b75cb8686c5---tazugidiwugexivewugowoj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/larelulewinive.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wexixudevafisuforilufi.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/58550127856.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c36894f1---zeravigom.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/kopokixofewepabapajexumip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AD 10428 bytes
SHA-256: 08dc9c9bd70fb91dd09cc02a4c17ca026d355fccf87cd77768f1c39e59b19ae1
font_01_sfnt_off00017858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17858 19284 bytes
SHA-256: bc8ad2d4690c4c06f82e29131950777639ddddf6b1118f2144d9bb4088fd1718
font_02_sfnt_off000198f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B109 18200 bytes
SHA-256: 6fbd8c530eaff55d4a94bbcc45072f5526d9ed7cd0cabb729a67f1c2359cd6a6

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