Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13b4e5b3a6647d7…

MALICIOUS

PDF

96.7 KB Created: 2021-09-08 04:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85d36e7d74a589e4502451e41fce7f09 SHA-1: 50a38ae6a9bbef2a50779966d463bb4affe99160 SHA-256: f13b4e5b3a6647d7394e616b6375b43752183e211b07ffaf6be2489ff456bc98
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be luring users to these external sites via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://cructi.ru/uplcv?utm_term=workshop+manual+range+rover+p38+download PDF link annotation
    • http://weiddy.com/uploads/files/202108271606544207.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a6c9aeea9df4b387839870cac3c37041/82656914251.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/biantk0q0q7o4m88cpgkoadikp/65556475057.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210820220429.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/85593680677.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/vonigapujifonepewigitalem.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d22db90fe21---fejepetaxemot.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/fizuwowusokalivaxi.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/sodirirapakibexi.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kabavapumovesatex.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/laxel.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/sagavexireg.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861ca20632e---27353390729.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/ropemoketeminarabuda.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/cd30185bb1d71bcafd0d094c581890fa/jamojis.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/tuputo.pdfIn PDF document text
    • http://kasargod.net/uploads/file/rarebofewewinabu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fj2hmdo5h9hvs5e9crejps1lf7/47246932164.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/76359656186.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/71475387706.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bopezijilimosesafalewi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec9c42acf5706cbdf22b389cc276be0/29511204777.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wevutazuzoxuzi.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/34036656851.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210702163554_9xr06u.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/92670167544.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/91755802046.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_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 11364 bytes
SHA-256: bd3536e2f256d7894eaf5d142b9ef0469fee936ae9aa8f76eddb56d713695778
font_02_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 18080 bytes
SHA-256: 6e60ab5bfc5a94466c9ce9b10e28fbae551e975385cb8e2c3de2c201b573da43

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