Malicious PDF — malware analysis report

Static analysis result for SHA-256 3574a249679b8a52…

MALICIOUS

PDF

77.2 KB Created: 2021-07-02 16:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c62be4a44f83db9a9a6f6c71bf259214 SHA-1: 9769a8aed53228e0c6fcdb4f98b4232c6cf549b9 SHA-256: 3574a249679b8a52e45aad39cd331832b917f30d5a92a9d28228eb701c4c755e
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, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content or phish users. The PDF itself does not contain readable text, but the associated heuristics strongly suggest a malicious intent to redirect users to external, compromised resources.

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://wastran.ru/uplcv?utm_term=paper+doll+house+craft PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449b32627---38307183320.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe4fec690---48208737045.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/bef3ddaaf5d67e894d695f58cf92b8a5/94651469651.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac9383bb8---kekovufudutodovug.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8dc6f099a05e7f42b7cc30021de0d4e4/rulivep.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd940e6614---27974917473.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rurazudezorufezubulotabef.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bcd49d141---3160850075.pdfIn PDF document text
    • http://seritour.com/rsm/files/85956487939.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabiruferimugasujen.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/41277531695.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1125dd53b9---98166925010.pdfIn PDF document text
    • http://atomleasing.ru/media/File/wilurezelowuxowutijavu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/22580622861.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a5e7949b---misogev.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16094983ce973b---tusabeku.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/92918601314.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a9508b908f6---48113087182.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e3e3f28190eae5916e54c5d2c9e0d79a/ravikenijasefawo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f3c4fcaa---80855890022.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2io65lk0omfmmn3fjos7v1h320/76480706796.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7f5e643137d8f32c0780b67c5aebf8bb/51231389273.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qmh5ugsia133fu435simbfs6mb/tixipudadini.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/92422553942.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724191d15e5---89618082726.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_off0000cadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 17116 bytes
SHA-256: 3718e38cc3b77edf8cd112dfcfac46592087c4503a168fadddbb4161db36e8b6
font_02_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 10624 bytes
SHA-256: ef157a6a64aaf135dd1f15501b4e4ca31ba6947fdb09017963e62f751bf718a9

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