Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2a3c66a96bfcf1…

MALICIOUS

PDF

98.7 KB Created: 2021-08-07 23:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c59b318a4dbfb6ea17910e355194e2d1 SHA-1: 5bda2a94038e95764586993ce7f930757c4cd8fc SHA-256: 0a2a3c66a96bfcf1931584bb9a3177e4396ed1e6ef4118966b06cd78d2ecc5cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://tylincms.com/userfiles/files/54125390919.pdf In PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/pukobikujosekunogowufu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69314dd8---8819437222.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/74036070256.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0888b77c2---lemuvenom.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059bd0a40b8---66583764463.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vtj0vu0jg9f7m18dd0kaspdgqs/teruvulakeki.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f57913197---66985280379.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/pekivotodomuli.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1525413e73a2db18101fbfbeabeee1aa/89458795315.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b885399550---31342247431.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/19318274969.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161009fdd7aaed---gixiledawodebij.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/14513084446.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/14685736464.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2037b5224---14043107135.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/77155830835.pdfIn PDF document text
    • https://doganagolosa.it/file/30804432739.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/60521415460.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/sqr3fp9u3jvhfghfu99v7png0o/wesate.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j5fudgo5glqpearoq9jjqr1mch/tizerupiwutowajosategof.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/95853164882.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7826e27155a0821ef0cb139fb191b6b3/11576899338.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8fc903d8cf85ad8604a9f2ca1e3dea7b/nuxatotulobimenolozur.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/sofogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=factorisation+class+8+worksheets+with+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 17732 bytes
SHA-256: 053e6c85c170e454cefd2397068fc62bc4cfa69abd25bf76b1bef41b65a968ae
font_01_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 10792 bytes
SHA-256: aa90e21a5c692eb64e0704444c9d6a76a390fa46224ca3033bacaee772c4db6a
font_02_sfnt_off00014c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16440 16280 bytes
SHA-256: 28d16b485c497b574fb9b2f073a464884241dafe15804aaa04eff33a2ff45a9b

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