Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f802df71655898…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b19856119b92da2cb522d05ac538d87 SHA-1: 8cc7a783998e629cad9904f62763dff06676f2c4 SHA-256: 65f802df71655898cd3b8bf3eda0d3b68155f36a5ad43350cf2aea0fcecfde06
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=remote+control+for+all+tv+apk+download', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=remote+control+for+all+tv+apk+download PDF link annotation
    • http://elpijisystem.com/file/21425264930.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/59426200720.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/4847140250.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/liworinafazimom.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/23562377381.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9c5a4f277350432cce096cf49bdc3b19/11496980002.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/bejedexe.pdfIn PDF document text
    • https://22importexport.com/eimages/file/wakupu.pdfIn PDF document text
    • http://spakimthi.com/upload/files/24089135648.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210919050726.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/26545250789.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee6c9ede2---zelidepe.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/kados.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/32656561514.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/34092337367.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6t7l26hb22v40ctskd449eljg8/jalesatotokutagibojamid.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/nipajerorutiponupen.pdfIn PDF document text
    • http://artepcb.com/upload/files/zowajujapevebe.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/3496263043.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137dff2958ef---29446872228.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/remixujowozifadojufan.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/36619073464.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/55424397935.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/65719853560.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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17312 bytes
SHA-256: 78f25522c9b116cc76df2ad042f1f0d0b057f8484bc4eddd252df03159988468
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 10812 bytes
SHA-256: 3e286661070b16ccff2cfe709347ba0addb6a55d00abc1ffeb73d60b64db754f

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