Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e12920e8e61e0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 16:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ba0a41b24c03d8ad3b09d7a64485b24 SHA-1: bb07510a2440a9690ddaf2077c2478d6a65c6962 SHA-256: 8a6e12920e8e61e0d03bdf01588ff1087f35b5ae3375cdcfd6ce8aa9eb579a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malicious content or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chmelo.hu/sites/default/files/file/49014202599.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/36755328867.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/33172513192.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4e6815dea6142e2783dd5040685134ac/lujusosikirabukorupemobef.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/68761955744.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d6322251---64705508685.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d8bf0e8a025e8f444f6ea3e875aca3a7/45560537572.pdfIn PDF document text
    • https://esz.jp/img/editor/files/67073449071.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210730_0F2C4CB024854DCE.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6a1ce0ec---gonipiw.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/67137368523.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/mitepanonifotal.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/37846438428.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083de96a49d0---bazabemu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1f071ce0ceacbe889555224a7441dc23/76719189734.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/gupakupidax.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/17620192888.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/89b6f90c96eaccca3039f45325ced88d/76219261966.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/175999a2213c33463f0447c57783cdf2/daxupotixajafelaga.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210728045106.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qrn7s9gaid2a6k4l6tir72a7og/badosedusoliwusam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=suma+de+fracciones+distinto+denominador+mcmPDF 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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 18956 bytes
SHA-256: ea81a526800b7dc01fd93673b97695241f272f274c75464785b84e457b840726
font_01_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 10768 bytes
SHA-256: 1304069ea600e2ff0b3889378263a83b73fc9f51dfd95aacb8446788756c1bc6
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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