Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c85589e7dc14b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 17:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e66ff6b920f074e94bcf7626b8bf6ae0 SHA-1: 7205bab62ae1b7a4b06b85654018051c373dd757 SHA-256: 9c9c85589e7dc14b0a4c1f92c99b2676686e30dcca004467b6b8fe6f31ce7f16
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29694119378.pdf In PDF document text
    • http://vuason.vn/upload/files/zaxulijedipudot.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210912113429.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/13566037623.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/gidikikofukezeguvoke.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/21807028959.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161470fe0d3457---josotavirisutaxam.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613395a497b58---89287678040.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40154189113.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/49828302059.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808ba9604c---luxukozuli.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/32938710737.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b2bf4d61f9a47ef258f6860b35c58822/kaxojalod.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/guxirokuder.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912194353_5tzz6s.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/27066715131.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/kipomafipefetogegeluzozab.pdfIn PDF document text
    • https://combrooncom.com/contents/files/tiludaribawamigugeviwi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d5d744e3dd556bb568a4d3b36c444cc3/7869742433.pdfIn PDF document text
    • http://mlight.cz/archiv/file/89722300751.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614741c8d715f---2728375840.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/xumefurewepurozowakulo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/12449093181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=iphone+settings+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16780 bytes
SHA-256: 9c27eacf6c7a765c951a21bc7330b0490853da403d62c3adc97d529f667fdbec
font_02_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10428 bytes
SHA-256: 15c518afef0b73227a334e66a5d51fb1527308289fb6ead6cb97b622aa000d12

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