Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ca122417bba839…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dec13279bc6da518f4c48b9fccfe7558 SHA-1: 8883d4e2a6cca06288765b2fac5d9c87fa45d3d3 SHA-256: 57ca122417bba839962f700c587535fd4a7a4a9c2c661756c82b42787707c414
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead victims to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f505610114e91bf2933d6f6dd4ba09f5/rusoseli.pdf In PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/lubefixunirosopodobo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sisixipedubonolerenebav.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/1659729180.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c2be7f79---77369848503.pdfIn PDF document text
    • http://brlairport.com/images/file/66847499273.pdfIn PDF document text
    • https://jetaime-shop.com/files/8096511713.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jalediz.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/punebeworijola.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/98242392772.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/filedurevovekesuruval.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/94bc03da5b2e9f401c3e956940ce88e3/funixenagijigad.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/90976f298d4a469c452f6b780e3b055a/movotob.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda6a789e70---jibujaxuganovirel.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_110211.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/pakapej.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/70206776649.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af7d272700e12880e48467787ce5878/78735043476.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/vetelazimeneduvabijuk.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9df6ca61---95473635569.pdfIn PDF document text
    • http://yocarbroker.com/upload/ckfinder/files/33072409473.pdfIn PDF document text
    • https://appfacile.it/file/sifituwugatamipopapak.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/10135859902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cape+town+suburbs+map+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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10876 bytes
SHA-256: c6e4715b5f212e22a012b78124cc45fef17a0528e16c4695b5f15e3a8e9e9776
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 18952 bytes
SHA-256: 6777f6ae0433b8c3593ab74aa0e286b15e325314943e794655da83012feca8ca
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1