Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8198bbd55e84ac7…

MALICIOUS

PDF

66.5 KB Created: 2021-09-09 20:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9fc0c6bad7116e2343d070cb213a067 SHA-1: d28d9bffe7bc8672d9667d7cb943a5244044edfd SHA-256: d8198bbd55e84ac78162acab2e3f997e0ec6275817ca0865cea13311a0acc852
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6961

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 https://giritrademark.com/content_files/files/zijelilifabuwufugejusu.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f78ee9163---temozagagogenopos.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/jufupubimoseb.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/gikuvixilutew.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/tuwadobutiwe.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/feputigov.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/12806310312.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133940974913---fijebojanotaxanis.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • https://sadex.pl/fck/file/86070197510.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmupocq9nmnkkt1b5fk4gokfe2/87945650319.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/51618528816.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/dikananisasifedawofekar.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/89620610936.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/60890683314.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/5145784226.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/japisakamenax.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/vajibikekalejatimipeji.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/misirafupe.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45021024763.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/33797756589.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/fanotagokinoxijo.pdfIn PDF document text
    • http://tonerihned.cz/userfiles/file/38051976380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+best+note+app+for+androidPDF 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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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