Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf64616823b02f1…

MALICIOUS

PDF

115.7 KB Created: 2021-07-09 20:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f47a8479e2e21c8d235cf8017f4b2c27 SHA-1: 243f439745b143572455a678fe5843066e6ed51a SHA-256: 0cf64616823b02f1b30f89ac9bfa4628a540f50f6994f3081e96afc74249ae19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, such as http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98c043927---xanejetetuguzaminadafave.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88d96b0f3---lilexot.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98c043927---xanejetetuguzaminadafave.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/64060562700.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fdcf6ca27---24974365304.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be191a8922---39722685247.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/lowotulisusugeted.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/sezogofegative.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/62553978664.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/vasikamaxaru.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zerogawurulasul.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bilifarejafoliwododokad.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/56146020183.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d905bb9b978---wuwupanidof.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2a077b9f---64629092394.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/aef34e3cd962c1a4f0f8d9b5d0c2fd18/71260672665.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c427e87e643---xekesapegorolegaxibotadam.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/waxuzagusozi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9bb4cab1---88504559968.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/26b722d6800da1ec882639a94be10fc3/loraxoravagupifemodekire.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbdn80o6b0gliod8setehe1rff/83611671527.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/52d28174bdf61d9a41ae77b5dd4020e3/36015481977.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/49980634939.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/kisogixizesaxavikenofojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=payday+2+m60PDF 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_off00016748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16748 16844 bytes
SHA-256: a1433cebd44878a1b21a17690cd9bac6d23ec894eefb71bdfaeb7013a557a414
font_01_sfnt_off0001934c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1934C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB63 10076 bytes
SHA-256: cb1aa95d8e0fba17dc87960dc9cb067fe4692d29e774d46d59c29f5d81660027