Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc188b4c03d8a01…

MALICIOUS

PDF

62.3 KB Created: 2021-09-16 12:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3971073863605025be85b502931e80de SHA-1: ae2336dbbe89a7395bfb42cd5c9e0fa174abd83c SHA-256: dfc188b4c03d8a01e1e3fed300cefa47274f1b139f9d7fc8bc81ae61cedb77db
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smobiil.eu/userfiles/files/96197005331.pdf In PDF document text
    • http://elistaprezentow.pl/userfiles/file/78209822737.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/34358328815.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/suboxosavip.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/62870518724.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/mazevo.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/limavefuviselodureji.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gokawo.pdfIn PDF document text
    • http://anindecor.pl/files/file/gutigepedobibasopasupore.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/148d11adcb62d1634191c4cbaf95d8c9/60366099255.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27842654383.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/mujotugapewutelaxo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f99ad06b1---tiwid.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nerokuzesamidunopaduriro.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pifox.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/werosarexusifud.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a8693a1ce---44157524317.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gekebamabedamelubefijuluz.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61426638616.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/5978635182.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wawubuleponiribiditoguw.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/42192141427.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31450230256.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a479dddc0c251bb645fe151edbb2bb34/kevukinup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+login+icloud+on+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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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