Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d5ae717159d681…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 01:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a3ebed961a487b722fa82a2e907dc91 SHA-1: 844aa3ca3e727fe9a56a5ca29747907b2dec9426 SHA-256: 84d5ae717159d68148d0c31e0fb0791586b73b0107412304a7363644d71a1a80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to appear in search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.nomorcantikjoss.com/file/36015068220.pdf In PDF document text
    • https://tutorsbureau.net/userfiles/file/mexebibibanetedobosuzefa.pdfIn PDF document text
    • http://pmke.cz/pictures/files/gudewujaxorakipifozerina.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/62769392902.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab780d8e6---govivekozopojekol.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/gupiboposejodugobofabu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xozozosudubokisaj.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1eacf5c5921533cced61879ab0ec02f3/94744978675.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/16481218093.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/31663738461.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/55298572111.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/pasulelalili.pdfIn PDF document text
    • http://health-bridge.in/upload/file/wetaluzojodenu.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/13135493387.pdfIn PDF document text
    • http://alltechsro.cz/files/joxetuxidibakeno.pdfIn PDF document text
    • http://cobmedia.hu/include/83571118675.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/kidufutedavifobefuremuk.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109132107488903.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/71576727704.pdfIn PDF document text
    • http://brukbet.com/user_images/file/14635776193.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0a07db2812f4456a37ad0245dcd97b3f/pesulizifegofon.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/82739948663.pdfIn PDF document text
    • http://vinmexindia.com/uploads/dekatutidivaluwumonuxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rbx+sky+free+robuxPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b41f38ee6---22908755909.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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 18116 bytes
SHA-256: 378482ac3764674d6b3da2b13065802e5daabed10b08db08e41234c1a92280b8
font_01_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 10296 bytes
SHA-256: 76cee25ce1fb585541a187f28c6806244e7294acee8c865c19d8f42d1646449a

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