Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed76405c51acd4b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 11:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9887c38da6fc695dca8f95edb106cb68 SHA-1: 1a029244d0edd53088a4d13ceb9b1f9031311cae SHA-256: 2ed76405c51acd4baf4f7f8ab072a38c6824b0bc0bec62f445b91cbb0357144a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=cracking+the+ap+calculus+bc+exam+2019+edition+pdf PDF link annotation
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f8133f70411ca15b6a0144dc0a9a99cd/85898395906.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/logolatekob.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/bilofilo.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/bukexeritiwis.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/figederoxugesopipiwituvo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc26c28d8e2---34835491840.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a840lh45gkft2tk4b80741gop3/tuxunafasas.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4424458bcb0b289adb0587e3c6a1eef6/15439085948.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088cbd5e5021---sorerofofa.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/14723858386.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/63f8632c0cc3103176338dbcddc9aab1/fejobilepape.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/dikekinitet.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4e90c435---wugutevusodubimadiso.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/87621136469.pdfIn PDF document text
    • https://kaimano.it/file/gixizov.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a38cdd095---34081643029.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/40044303371.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8036639a7a---23464741953.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e310a7849a2---19006255203.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/sufijojiranamunapetoniniw.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/34520568206.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/vilifajajat.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/26611616403.pdfIn PDF document text
    • 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_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 17056 bytes
SHA-256: 704367e3da4605528e334587ff296c4953ed5baa268a8ecef70fa6b07058c4e1
font_01_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 11992 bytes
SHA-256: c0f2edbb86ac41a84a4d88929f93dc3632b0b752921677b1af26d256d94d60ac
font_02_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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