Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a914f620d29fad3…

MALICIOUS

PDF

74.0 KB Created: 2021-08-17 13:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77b4985667f72aa3862c180817a547e5 SHA-1: 24559d21cd83a8be3e2d90e5164e7908df2085f0 SHA-256: 4a914f620d29fad39c6bac1aab826b6254592cd47b97850fb5122206915d4d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of a link farm and the ClamAV detection strongly indicate a phishing or malware distribution intent.

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://crysiq.ru/uplcv?utm_term=libro+un+viaje+de+vacaciones+roger+par%C3%A9+pdf+gratis PDF link annotation
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdb2ebaa99---fozuvuxujogi.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fesukilutiwixosaxemuxu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70f782b8e---kabugamizadiketego.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcbcc540b---33269236946.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/50434935743.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f36c3676b1d---30797316999.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/48052167982.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/831sfnqa0a3ofrvagm4koro56v/datow.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/devifutafutamutu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64c52a57b---41068397603.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b0a084bdf---fixonuruvogod.pdfIn PDF document text
    • http://ibb-online.ru/f/file/26948231778.pdfIn PDF document text
    • https://123natura.com/stockages/files/tajezape.pdfIn PDF document text
    • http://mav-auto.ru/images/file/16016364915.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871a3da3ce4---dudoluzafujizagabaroborix.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/saxefesuzerefo.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/regolu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/rajaguzisu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e2b3198d---kawivuxaxagapodi.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/74942413419.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cd1c78108---44558860326.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/789c8fef383edf2b55eb12ae6ec39f98/75247189544.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_off0000bb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 11296 bytes
SHA-256: 2eb63db7e4a66f99aac2c61f1b2cb35d80ad7e23ae465e9080099522bb4bc026
font_02_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16780 bytes
SHA-256: 0c15a6d7fd14d8b8236d30af11fafa1b98899de3e47231921295bb7ac98ea4ec

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