Malicious PDF — malware analysis report

Static analysis result for SHA-256 023be292916e222c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 16:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c06b0113a4c45846025e52cdbf1cc27f SHA-1: a424013d6238266669246465d6c9a04d37594e65 SHA-256: 023be292916e222c323ff0abf657fa24a2da9385be26147c62ebd847e2878e62
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 disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring the user to click on these links, which likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://mlbcsimleague.com/ckfinder/userfiles/files/kejetojowegitu.pdf In PDF document text
    • https://samuelben-horin.com/userfiles/file/18122788554.pdfIn PDF document text
    • http://ihdbd.org/upload/files/riponibixekubijirod.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210917_161558_174.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/48339846137.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_012343.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/69812403824.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cec726c5---sepekitenuvujokifudabeli.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/43828983279.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/jotojixaxixino.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a820376c---77747347994.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/52082349804.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/14742955571.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5362e199cc46c17889a071af26aaad44/rufivasomozezuzudi.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/rizud.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/magorotafo.pdfIn PDF document text
    • http://chinalabware.net/d/files/99338684173.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/nixenafufijufifinamipez.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/nugutaromufiwireg.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/bogemarapimevizoziro.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/vejowajimukanapi.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/86759429503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+quite+place+trailerPDF 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_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 10200 bytes
SHA-256: 49a00b119e5e23a5eb55b3334c6dadd0a1c9717771ad87a38da8aa06d0ce3b7d
font_01_sfnt_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 17336 bytes
SHA-256: 91f109e361775f6ec647d1a19155fcb28ff2db6073211167a21971209ecc3554
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1