Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cc0b190adcfc59…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 14:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fd347f6652900aa3d6cdec52d2d4e3e SHA-1: 49ba0316266ccf67e6fc89b5568c0952ea4a4128 SHA-256: 33cc0b190adcfc596caf72d5985f614c7496abd1a0729bd8d540d3ba722bc1a5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used to distribute further malware or conduct phishing attacks. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c72877e5a---zakudotax.pdf In PDF document text
    • https://satybharat.com/ci/userfiles/files/radugupupinepogitituji.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/razowipelogeparukitalega.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add9586bd78---93509606648.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4f6906253bddbfbe1d6751ca941f6cee/42597495038.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/xadozowep.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd656004907---32290155639.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fotupimaguvisuxigedan.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7d658b568700edeb2f127fe73bb078d9/xotefirenopafabolibimu.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/23073498457.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1326d574d4a0e3b50c3e2a9fbd0c42fc/zupirizivepagazuzepux.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/rg67ged40k0kl1mpdm88ikkit5/99716947998.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16094187839c0c---69860410043.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145d33d126---nelav.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/sigagaloguradijijo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ca5bb8490b609ae0ec1830d02e9e17a0/danezusanunitijo.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8noen7lc20ri790nsusnp03d2m/repoponujatew.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210801_50E3F297D48E6B0B.pdfIn PDF document text
    • http://erex.hu/upload/file/90647876804.pdfIn PDF document text
    • https://media-get.com/userfiles/files/51111694984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=comment+changer+un+format+html+en+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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 18824 bytes
SHA-256: 279a858cb39eb8af633c8fc1f038d7357e8725d4b35b85a5d8e0f3a7941d35df
font_02_sfnt_off000131b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B9 10940 bytes
SHA-256: c68e4faf4af0ab3b1c5f1a248a551662973dde9a7d7f63c2e8d94429187dc89d

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