Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba56a341c0c0c6a1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 03:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbe0feb9e08038c1f093ae72a1858c4a SHA-1: 70f81d7755e34da6d95f42044cb1827e91070bc7 SHA-256: ba56a341c0c0c6a1a90d40f35eb2dea27a25add0801745ae3674acb2a5bac1c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using compromised infrastructure for hosting malicious content. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3664a245907d2ed540f27651f08580f5/zusesoloxobuzagepopebof.pdf In PDF document text
    • http://bike-aholic.com/UserFiles/file/78354099762.pdfIn PDF document text
    • http://origo.ws/userfiles/file/73066888916.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/31227389704.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143711d55a72---gemuvuduxevor.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/gifuwipevaparixex.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/91342102448.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/49411685509.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bc1ed052---32533307790.pdfIn PDF document text
    • http://hidramaco.com/files/files/48596114689.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xaziwexuxi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3af0a1b62---tivoduwuwezopusijivibusu.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109090620397515.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161427c5a54627---52335209264.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/96280005958.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/73599cef62bf267254aa357ce6a58b9c/kuwugapuv.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161458eee7f05e---50891790851.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/797c93707d8e8365d6920e11ac40637c/87131515252.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135af1d348d2---wepomifatitujixakovuwod.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/82246028081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+dubbed+anime+app+for+firestickPDF 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_off0000b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E1 16044 bytes
SHA-256: 8681b013444466012e3eb666e39ea327c138dfadae4087269e806b81cd07b223
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 11120 bytes
SHA-256: f6d2f20c7fdac45c95a7ef4681e83296b7305d0d730aeb28d4f6f4bb88d68bc0

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