Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8436a8243e3d50…

MALICIOUS

PDF

64.0 KB Created: 2021-09-01 09:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c9fc4e3bd4acf786cbde58c7c87db74 SHA-1: b7e43582c1edc9117ca420cdf2ad09c7bba7d504 SHA-256: ec8436a8243e3d50cdad741cfb5c01b9a603c612ef8fcc444ee9443649dac5a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6902

Heuristics 5

  • 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
  • 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 http://bigsvatcharasith.com/userfiles/file/wijevevenedoxuduraturuli.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ded233575d66a93ca327bbd7d6f8467e/sijirup.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0aa8db3d9---kanex.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0043041c30---xitonu.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/51200695552.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/jetegizilijefodemanuvape.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094232e3346e---giludo.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/masisizaba.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/25192108448.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9127c0ee9---lateragubinofibanozu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/896f6adeaa9a309f559a1b7a33c4c1d6/vivonuv.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaee44d07e---zonamarib.pdfIn PDF document text
    • https://preciseenergygroup.com/media/27301153355.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u5r91isff0uk2vb5d2khhrgbc4/24473053659.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/putiguzesika.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/33798179561.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/lakuwutumadapus.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aorbrk614g7csdphpk4i3gihnm/jazuwolutedigufadanapu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/44300635880.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tiruveruveduxeg.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rjguhm8j6rn07l0m2h7ckmo565/30643288611.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bafumi.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/8916306205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=in+on+at+prepositions+of+place+exercisesPDF 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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 17020 bytes
SHA-256: f9d6c2a44543ee5042e23abda2083be8ca0157639d7e81ea163c17f43f018e75

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