Malicious PDF — malware analysis report

Static analysis result for SHA-256 a170e0643cc6bec2…

MALICIOUS

PDF

99.6 KB Created: 2021-06-27 21:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af80e62f4d92b140e8ed4d033226102f SHA-1: 948a90bd0258b9fa14b91cc59f1ce463876450e2 SHA-256: a170e0643cc6bec20a2deeda5c8f7f9a3f2b3b3e1d760e2bbe6ebd57155a362b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a malicious intent to exploit users through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://infrive.ru/uplcv?utm_term=pygame+draw+line PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b35f74cf464ae21234557065caeee0a7/55664277561.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/86668377303.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/17ff4f7fa7c73a67cc021d2bb93f8da6/70217986373.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tisosukuxakeg.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qkj2a356jlcb4j42jvvgn715vm/52520349292.pdfIn PDF document text
    • http://goref.ru/files/file/buwozigugoxogirikinu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ganun.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/26176654419.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c550cbda91cc5efff3b727b7e7496fbe/latofijobebumuzuf.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28270d278---29459782190.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fuxadesagoserizi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a481ddc48f25ef87ed38fa755242107c/beginerelumir.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca71fefe---82574396352.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e71dc36a---82981348387.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/91645376117.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cea1a968---10040291349.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a807ffa2c73da1f6dd74bcfd041564b0/23123788870.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/j6f6t5o6usi7493ep8sm6na9p2/53855642922.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/0ou4tau70d4vc80mt8nhfjn065/12927049491.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f251fddbf4bb2a1744cd3d8545e37f40/nimojozig.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zikofujar.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/lofelexikozexugupaz.pdfIn PDF document text
    • http://dhf-china.com/d/files/fajegubuzikefova.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_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 29040 bytes
SHA-256: 3a2ece7e6a5f135c10d8675be07755d9772db8e21bccd953752d8f39371abdd9
font_01_sfnt_off00015200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A17 10408 bytes
SHA-256: 33d820a5fbb953bfbf2e5422a8ad27dc9a72c32b2f3f8b160bc3ba3ea4e43ba0

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