Malicious PDF — malware analysis report

Static analysis result for SHA-256 c456a7d6ddf5d476…

MALICIOUS

PDF

76.8 KB Created: 2021-07-31 17:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffc0139798cf209ff77661d40defc1c1 SHA-1: fc55253c46e325964d00c47a8100b653ec15ccfd SHA-256: c456a7d6ddf5d4768bee3367fad2ff94ccc90fcd6b50ddb52e8746998257ad0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://security-m.jp/tool/images/file/55040664105.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/61d05252275ee0aba4c846cf52101489/83826333876.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/tilarotuwiz.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/58514296250.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb360d72a7---78368241841.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/030bf8826ee786c86e400bb09e302830/ximopoz.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/90a86e45433e712f51290eb9ac502b4c/3445634812.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c91aa5e95e---wetedijabe.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/bakasopakaxeru.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8itrbkrr9tj67cjc9a88r2vkuu/83800525208.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/veweku.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c57d7456---60359316909.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/jevofebewofaxunejop.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10f305ec3ba8c01e63b83aff910239a3/romiritexezudoze.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/da4d3a6220ef5ca27c4d8c130e2ffa3a/mokadisanuxupufuxegutupu.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/71264195568.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd5519b6---90436996069.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/75082921108.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa5a3c852---razelapotun.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gezasufedejezasafuxegij.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/91624073665.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/30a9d616f71a4c0474eb9b8f1a7ffc98/83414802777.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tomafokubarapuvokeluwad.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/mixokitebun.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fd705def91d211e91d7ed39bfb3c1289/vorajunatilorateko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+size+is+a+large+in+hollisterPDF 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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 16580 bytes
SHA-256: 09b2a81673ea8293884b2da99ad510f98a6cb7e49596562cb71df97a2fa5cc1c
font_02_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 10440 bytes
SHA-256: 8bc6d6ffc56b6ea403e7751d71216d2958483fb9c7b134b51a440dece68255d1