Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc98d8b6e38594a…

MALICIOUS

PDF

77.7 KB Created: 2021-06-19 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95956fc1f1d209e1b5fe1d892772e8a1 SHA-1: 308faa8d8f81efe07ef9067848c1846b8f39e4fd SHA-256: abc98d8b6e38594a5d3c0d19c55b7b51e2cb14e3bd2bf3c3a63057155398f0da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zoncmswebsitebeheer.nl/files/editor/file/lidirupona.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4o7simb19t66g3vhtsciki52u1/tadimasilakake.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac915962ee---jivifegubajenanavikixe.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c3f38d50e---82417314935.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/wotaligajapivetatulu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/km6eeh9gn9vr3s5fb30cdvje6l/boxijelunovajawemoruwo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/35720112416.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gakoxa.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/monimugi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9hssictsmgmjtru7gmkq09oi72/vudagomutekabikaje.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/53a626c43b1d518c787e4c429731c1df/8335273035.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bebb7bc7a---72630784483.pdfIn PDF document text
    • http://ligneus.hu/upload/file/80776446552.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/b55rpusvgoa65i362m62sjlkih/94460124485.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/45940557304.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/29d033e3042ff510ab9e141481a1a2af/runaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=70mph+in+kmPDF 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://scripts.sil.org/OFLIn 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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 4732 bytes
SHA-256: 892d25acc3baf64715fd8248d7a031c996bf950eff5d87ad9eec0cc9c2b47518
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 19188 bytes
SHA-256: c5fe5239b88bf4d71fbf0126b6e85fb0b41b98d4662da0c606205d2d76443c53
font_02_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 16216 bytes
SHA-256: 5cb4188777f33cd410073f8b9d14bcb5a62f3956273c75e1cc66e568e6902af1