Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb41e0192f18197d…

MALICIOUS

PDF

77.3 KB Created: 2021-07-28 10:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd75cb061663add302ef3abb809d9707 SHA-1: 63de4437da825c8c8fb920c9468a10105441b0e0 SHA-256: cb41e0192f18197d788dea371fdb998033ebfd6ffc39e2666544fce0b775aca6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://elsekmont.eu/userfiles/file/29666855177.pdf In PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusidipajepesaluw.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210602_0FE75D7EB1A051CF.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/28m4d8ot3vfvmn2aht2acue1lm/femitiv.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///51086636933.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/wuroralajavavutiretopudo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1ef30456---54796071671.pdfIn PDF document text
    • http://princeverma.in/uploads/files/wiluzilo.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/nutetizotefiwedarerajetes.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/r0sgase64ee917m5e7t5f9gcf4/nuzepobovukero.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lefutizedojaven.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/51cba4def9ac8f51f0c4cfecb0612fde/23374136055.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-4/20210604194408832375.pdfIn PDF document text
    • https://deepex.hu/hirek/files/girixulitazupowozenonubu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zafozepa.pdfIn PDF document text
    • http://myredm.ru/uploads/file/31822757054.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/42131854285.pdfIn PDF document text
    • http://vejwun.cz/images/birur.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f044dc04ca---81958547642.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/rusuvajikejadekurom.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607506888d48d---gegira.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/2951040084.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/pubiju.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/lixogogugerafoleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=john+deere+790+repair+manual+pdfPDF 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_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 10928 bytes
SHA-256: ba46663b9e53f0495c5ee6cc63084601374da124963ea6fc61e267d228ee41fc
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 15932 bytes
SHA-256: f04df475e10f4c0fc80a7b427d157144f3fc74a4f7a76f76284840832e09728f

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