Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e6e2c113b71c4c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 16:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84949636c9e1341cc646c0134a6b5a5e SHA-1: dc49a17013dbb4df666e432622f89d1d4268dde5 SHA-256: d6e6e2c113b71c4c402a15f47080d5bd166fa0d038d566285810614d12be9f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://crewmak.ru/uplcv?utm_term=hacker+launcher+pro PDF link annotation
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/49864092236.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/buxasokof.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/zirepaxirorusanaje.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c385922ced---misokumelava.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/91209010365.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a8c692b4835c588e80de004983ceabc2/matilowej.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/jebokufuwofovepob.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/wuwejilesefufafuz.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/fidorajajijapa.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/bozofowizopoxusurir.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/sapunifisugogabuwagevogat.pdfIn PDF document text
    • http://keramann.ru/uploads/files/72787569428.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a388203782f30b0e01c5ce149e814bce/58928220714.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/33818416944.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/93904796738.pdfIn PDF document text
    • https://thehouseproduction.net/file/91294938850.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/dekutoxagopoxox.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/45152867879.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/gakewutuligoza.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/gedajegeli.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/nefijuwuta.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-27-06-44-25-37.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/xuzodenalagupitipuvanetop.pdfIn PDF document text
    • http://stattus.com/assets/file/66274886857.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149be410bb22---memutazetabufiwigaze.pdfIn PDF document text
    • http://china-steamboiler.com/d/files/biwonozibujono.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/121430292.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 16624 bytes
SHA-256: 16d660f1d5aac148cba5950aa75b6ac4b0fa4b81d3fbae44cec10944743bfa0c
font_01_sfnt_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 10296 bytes
SHA-256: 2d7c481d01bf76c4d6d1aa13cd3dc05aa7a446acd32151805da949f4c6b62bca
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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