Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fd3eeaeb76e1b7…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 10:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b883907449884f0c4f03c70f755817fa SHA-1: f82a38af64e436e4ad1dda0332fa902c9bea0cbd SHA-256: a2fd3eeaeb76e1b7400aa06901671f1a96507dfd81db5fa43a0d27d122af54bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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.netcorp.hu/data/editorfile/65823794206.pdf In PDF document text
    • http://stylekd.ru/files/6898098445.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b053ea0d1bc---93119243679.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0e0b610d427ae017607785d865a1a59f/potevoxojiwufutoxajoko.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/lobijufuwoguponi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa590be7a4c---49525526388.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/pagawizikix.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/aadc75f540d54c00f1788070f978b5e6/xilazudubemofalo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d08814009---11318479404.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ac1a512d---regafozezariwedofaso.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fa440d9---zegaj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4nlujn9hvrtv7l8stqrmfvkee1/narojiwigevemukaji.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/wotezo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bc5da6bd0adf69e020b8316fe8ca2e29/ramusugikod.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/90251924447.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xunodigipowowaxelepa.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lujivo.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11824359173.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcbfefe00---15001174950.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/19965604933.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/47526998832.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72edcc4413---vekek.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/vadaro.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd5a53ab8---duzimatitabibofowuwupibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=but+i+like+that+girl+too+much+i+wish+i+never+met+her+lyricsPDF 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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 11188 bytes
SHA-256: a8818fa1e50a00c3311a7c6184922c8c2a4ab1472314d76e86e43550625e0e68
font_02_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 18080 bytes
SHA-256: 5bfd14ce751dfa3063438fe861a4cbd964a9b0e393a1882d366fecea3099542e

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