Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc93e50a5b6c50f…

MALICIOUS

PDF

99.8 KB Created: 2021-09-13 06:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5283f8da2f24aa53557b5b0a6828a9ca SHA-1: eb8d200239f57ccb3c2caad617d7c2fdc20b8afc SHA-256: 3fc93e50a5b6c50f07b97e4301a12109e68691ba526baf477ddcab8075e75e69
176 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised WordPress sites. The document also includes a lure to enable macros or editing, suggesting it is designed to download and execute a second-stage payload. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://chcial.ru/uplcv?utm_term=baixar+emuladores+de+android+para+pc PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ufq9qjii96d7k3nb6orbpj9912/70646094032.pdfIn PDF document text
    • http://gugugroup.com/userfiles/pebija.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/sogixu.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911134429.pdfIn PDF document text
    • https://digicpictures.com/downloads/74452795263.pdfIn PDF document text
    • https://synersys.fr/contenu/file/mezonarumonakovigunat.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76fa3a73d---19454184066.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/54033564039.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/wopoporevutagelo.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/445247423.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/rufanipevobovenub.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/bujabujubixerat.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/28121032028.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/bixogiruzanixe.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/dijadasaraj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/paiqeativqqqa8mjjk30di1l4d/jipiwawumirofi.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_232002.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/14531337155.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/99568587886.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/lizofefasefesilemaf.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/danerijoxinaxasufa.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/79236672011.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/55700580594.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/87518850321.pdfIn PDF document text
    • http://hmed.vn/upload/files/5755339870.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sugufugosatojajikat.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_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 10832 bytes
SHA-256: 8067bf8818d02d4cca4c7259f40cd5f859214d2da1c491c1fb553d645b652a13
font_02_sfnt_off00015239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15239 18140 bytes
SHA-256: 90e941c21f09bb39b125fc2eab728ed394e9d93696a61beb0e1bd3b298ba322f

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