Malicious PDF — malware analysis report

Static analysis result for SHA-256 43300dd95fc2f649…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 16:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d352b0b28f546849a1c61fd04f3c272 SHA-1: 147efc31e20ebbcb64b5dd3109dcdb3015a20c72 SHA-256: 43300dd95fc2f649f7966c92976b96e8caf23130d848d6b8503610618709e379
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=funny+giraffe+gif PDF link annotation
    • https://aporpeter.ro/userfiles/file/zikaz.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161426e3b48169---77901363193.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914064600634752.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/84681896899.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/36496521484.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/wujibovetoge.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b551f3f---serakokev.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_200504.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/17498007575.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u5vg4qqm2729s2ga013g6vsmks/xogejazifimusovuna.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/72899587756.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/kidupogakeduv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130defeb98d5---98439635733.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/bakifadujol.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/90917393644.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/47249825724.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/82845025755.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/84774478800.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/21472890169.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/suvaxuzu.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/pazatekuli.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/59309938702.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/161303651.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_010132.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/beverixu.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_off0000bbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEE 10148 bytes
SHA-256: 9b8543f724b1c0daf1bab04233cc4f6963fd474d23e1a06c253520313a5e13d3
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 16032 bytes
SHA-256: f97ba4d47aa9f70d7e8a2fd458992d81a58e6cf068d5bdc4b85526efefcc236e
font_02_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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