Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b9360aa725198f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 22:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8e8f6fe96d8388ed9a40966c2d4dbd9 SHA-1: 0036d42211be6be1e0cde9d7fc55ea6781d42861 SHA-256: a3b9360aa725198f3c91d9e99d89a50e0d3a1734b5faf3bdc69219cad673a48b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and embedded links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://stacjaregeneracja.pl/userfiles/file/60898284442.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/90122876777.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139de80693cc---baxulebigi.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/62577198643.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161376ef0dfaae---xiwaxikumujezoxevobaxa.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/winilalitosagevexuzapo.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/4905306171.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0a774b6b---70639853810.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/79515495923.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354a6be7241---varuxufezilili.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/95792726303.pdfIn PDF document text
    • http://mylodge-naoshima.com/41402209088.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02aa894a8---xaduzojozobuvojamepeta.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/38216259889.pdfIn PDF document text
    • http://abwva.com/uploads/files/20977230488.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/nizoguvifumotixaw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380be6cf3ed---88204874740.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dumil.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/zozifawewuxipe.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/petovefisovojosug.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/95949029895.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/palulobedukafojal.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/9398493548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stream+live+tv+free+websitesPDF 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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 10516 bytes
SHA-256: 29baa0cbaec32d31bbb3096025209f571e018e6d952ed1834524601475fb5d63
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 18212 bytes
SHA-256: 978c7153e69ee8cac698d195704ca3755aac10cd027ff4d123204f753007c28d

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