Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaa6e0d6808c4a1…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 14:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56c1117b78e5fb6ca7694aa7d7a65239 SHA-1: bfab1cd319ee457c074e8ffd9d1112a02c079948 SHA-256: caaa6e0d6808c4a1f7d4607c79571f5140c3c248ded9b8d9a7248e7763372b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f736cc692---zurakumufamiwaraxepi.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6f5773df3---12475909081.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/20172555184.pdfIn PDF document text
    • https://aaaxxion.info/images/file/wusuzagisolusukonew.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/23506552754.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/raguturodobexapim.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/395d91fe191f9b7a270e36612b37db6e/vaxixakazefibisufawofop.pdfIn PDF document text
    • http://biosite.ru/images/news/file/susus.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zenazopikugifir.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a673810bb---wotuxadopebosanijovewoje.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d8a8b3c3---sonopin.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zatesufuwifil.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/51413989348.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/721165a5bf73895baad946bf2c809623/vovitematinanudanifup.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/tivataguvapigunuvapewut.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/37227643755.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/49205469649.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/kizexovanerarekapitofumof.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3c0f0aac7e813b6be498abac38034451/10651045080.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/jelabifesedaloniwagi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/83515800424.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/gisudo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c122bc0f781---razununafivagijorok.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fjfniag172a5q5sk3msrdn109/muxefowiberalagunifulapen.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c796d6a23---71163504971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=netgear+nighthawk+x4s+ex7500+manualPDF 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_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 17104 bytes
SHA-256: d9e18a07d26d5de27c1f5d0d51a442365e150b1dee237ea692fe979f5a378dce
font_01_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 11176 bytes
SHA-256: 37ca4f3e2cd9f382ab0f5365707511407d2b98756f5606b733e18f0eb9016363