Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a87df98d1cd24e…

MALICIOUS

PDF

58.1 KB Created: 2021-09-27 13:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a21e7c2c4c332ac20e2a2dd8b9553f4 SHA-1: e281e847341a6c2035c7b394f724f1d071f0e747 SHA-256: 47a87df98d1cd24e3ae6f3035e569906e8217715dc71e53902d361a8ce7761cd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7061

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://letstravelforacause.com/miet/assets/files/nowumu.pdf
    • http://fitviewer.com/files/file/guninovigeputebazulugot.pdf
    • http://abwingstop.com/uploads/files/78733169614.pdf
    • http://altus.pl/userfiles/file/posobirusudusuridagate.pdf
    • http://iberryhomemade.com/userfiles/files/pikoferakeselari.pdf
    • http://thebookmarkcafe.com/uploads/files/11722456544.pdf
    • https://jagamimpi.net/contents/files/79123558299.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/efnst976cobve9ajhq693dj1np/befusiniponipudelinikidi.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae32fbf820---51976785710.pdf
    • https://slotpt2.com/contents/files/vorazugoli.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/89756940702.pdf
    • http://gro-felix.si/uploads/81860854279.pdf
    • http://mnwebdesign.dk/userfiles/file/38515432106.pdf
    • https://mirrorlink.com/public/files/files/nosuverutuwujodukizokuk.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7e4012d24ef5245f7529eab82de9452d/zifatilomijugowe.pdf
    • http://akvari-um.ru/userfiles/file/sifaxoxetixug.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fd1dd690---farelew.pdf
    • https://matrixx.lu/images/64354206656.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8a84d488---12727163587.pdf
    • http://subded.org/userfiles/file/duzorizokawugew.pdf
    • https://delphin-bau.com/ckfinder/upload/files/buvedufavonukajawutena.pdf
    • http://delfosventures.eu/userfiles/files/sazerelitof.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39366468974.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+apk+editor+for+pc
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000affe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 16792 bytes

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