Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b43b2a2489213c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-15 06:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 854eb0185ac909f3f4bf371e6edd4e7a SHA-1: c7c5753ef4708af9b760a106ef97d8e138820f2d SHA-256: 73b43b2a2489213c19afd9e06870f27c7739f64421b451fd49c93c99978d5c4c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://phuketwebstudio.com/ckfinder/userfiles/files/26629094814.pdf In PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/nagenodaritefovan.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/18f18ee935003ff0243df8aae5896244/bejozozivojoriruri.pdfIn PDF document text
    • http://355353.ru/userfiles/file/95809995664.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/4670672218.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/40012550579.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/nabefuxekovazitoxodoxave.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/suxadiwagezipixe.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613145c07d648---wefijedadodezutulipupug.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/65821781757.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nkbdrinp017ad3etn3othpsq8u/13580019618.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408fd387b8a---44513494021.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799edaa5a4---suzefobobelezapakomoz.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/78784200559.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/89055125124.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/ziperepekivezape.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/51720477231.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/burujexoxegomogopubonexet.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b04115c---61206911092.pdfIn PDF document text
    • https://betsin.org/userfiles/files/wukexuwego.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/lunisakugi.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/11926313248.pdfIn PDF document text
    • http://moristas.com/userfiles/files/bozefepedeweninutewebu.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/fomodiwipudakose.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/84263130383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=como+transfiero+mis+contactos+de+un+telefono+a+otroPDF 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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 10768 bytes
SHA-256: 76f63f0ccae69e239c522d998daa845ef82c8405eb45ac1cf48ad4995ed219bd
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 18684 bytes
SHA-256: 5260812780889bee38d733b974e62b51a12bc276e9df2161bbd0660dba7053e9
font_02_sfnt_off00013e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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