Malicious PDF — malware analysis report

Static analysis result for SHA-256 73db0bdf9a8e4f0c…

MALICIOUS

PDF

66.5 KB Created: 2021-09-13 16:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de7baa53f13ede557cb3ad25ac25ae8a SHA-1: 5053d6258835261be9365c6dd6e928c1986c703e SHA-256: 73db0bdf9a8e4f0c123030c4f9186be95d66ffa62d3491c69ef77166c64a12e8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs indicates an effort to drive traffic to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 5

  • 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
  • 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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139866829038---63994309713.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8bb773ff7---wiziden.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/vopukufofulo.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/25467506614.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/fojul.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/pejowukas.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3131462a5---49389101540.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/66816327169.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/34231832831.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4567054d5da7d3d367d6e1b8a8b75e5e/41034219983.pdfIn PDF document text
    • http://chapelguild.com/images/usr/veminetok.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/zogorirotojesisilorotet.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d54090eed---rewekabigedituvimu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6b7910c2c0d8e392156f2b56da9eec67/wonexilikani.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/vonodakadapifok.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/papijobodefasuzojilil.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dakudepafotepusuveb.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/62604870837.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/90216106245.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/nakizajidafigesejuto.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/gaxinusibumodosutarasi.pdfIn PDF document text
    • http://saktigroup.in/uploads/31996138387.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/fivopozonefi.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/fugupifikitipafejiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rufus+download+for+windows+10+pro+64+bitPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1