Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a92391b3f076b9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 22:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fcdea3729d090b9f194e3edab831759 SHA-1: f0d24f2bbdfee422969291e5cfb2338d19068c42 SHA-256: 07a92391b3f076b996e7bf885725557c661ecc4b7e970eefa105dc43d5fc0d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://krisoc.ru/uplcv?utm_term=parts+of+the+house+spanish+worksheet+pdf PDF link annotation
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee9281ece---fexaw.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106082346422019.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/miretajodawonapigax.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/xiguwonikel.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4eefb4c2a---fewepijapap.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/nilutorusalenunefo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/997bb5129c365622a5a883a6036fa182/wugebibevewufafekosumek.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pisezef.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/48207043154.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/86305390914.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/68146432752.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdc1d15d1---jemijizamekababajux.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/66499988964.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/rolavurifotodixozetobirev.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/562ab83721f2e4b23b6ea5f729c7401d/tafesuzobevowesoge.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/82348465607.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8d99a9d06f9baa6bf2b2a487c5e6cc26/15156457022.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8f689bcf39e4745b8fd1acf3c8768d04/mawugoxivefiwitolutuwut.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6holf7d9eu2rl9imp3if50sgno/wolovafetuxewuso.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/59446154997.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/38915475051.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/63152833841.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb42ce567---womosevotegebejonesusodur.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed343c4f59---52518672483.pdfIn PDF document text
    • 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_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10828 bytes
SHA-256: 0380c058ff77de2f5524ceece7ebf58ed5cb54d847b9defa95fd4854442613bb
font_01_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 19752 bytes
SHA-256: 934d434e4a1fdf63b03f3a71d2cbbfeb9e0c5d6e2219dd4266e86e0ac8e01dc0

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