Malicious PDF — malware analysis report

Static analysis result for SHA-256 59176f703f22d83c…

MALICIOUS

PDF

92.8 KB Created: 2021-07-24 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 187050faa1f530bda18e0b0347b53ba5 SHA-1: 195c7586de85bf1ef4b6482e2c8bc93529569c70 SHA-256: 59176f703f22d83c894cec3485e39ee1d531e5d2f7be0384cd2f2cdb2f7d9dfb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm structure indicates a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cukiernia-waltar.pl/qcms/userfiles/file/mapoxa.pdf In PDF document text
    • https://cvsc.co/userfiles/file/56384831711.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/35620941837.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/07c5f359fffd085aa25477662be9f567/23939147957.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gazuzuzegujokikezo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b18eb57f77f---24511185237.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f019e904ce---bikorun.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ijk9kqdsckhh3lrr79qsrboi80/dibigojodilalediwuwel.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d7ba07adde80d6289bc5725da3a1d044/vasuxigaruga.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/vusamakuvufogezo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ods864pejr31oadem62jupmfnt/50367342345.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/13ef4d520c0d016008261e18bf97debc/62199800765.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/376c22ff8bda1a243fb4c11b1180dc06/4434840198.pdfIn PDF document text
    • http://dzbnf.com/upload/file///dutowopisigu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/25264218238.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3069344d12bc2ea502609681600a3323/88365602355.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/ginoju.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/wuralerojemowo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xebaxoguzegewowewarofinu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7skqif113qnlkmhpgljs3pvbh5/ruvonawiwevor.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7b22b1103143bcfd194f593e83103408/jinujisumukatake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=by+the+pricking+of+my+thumbs+something+wickedPDF 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_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 11444 bytes
SHA-256: a993ac2406aa462e1963ffbe957de6505c652fe0e3f6d6a00314c5f6a1c462c5
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 19052 bytes
SHA-256: a427ef39a97ad453d705370273d6c6d53573d6d4ec6994804520bdc140ee9dde
font_02_sfnt_off00014d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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