Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c67f880c7f87b91…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c00ac1471f845cfa2ad7711967f79cfe SHA-1: 3ca2311a9b460b0138381ef7780f3fa55ee47b1c SHA-256: 1c67f880c7f87b914ed5f614eaf11deec7c33be9a8a980357bae7a138c13cdc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. The primary goal seems to be to lure users into clicking these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--krmer-dnnebacke-1kb72b.de/files/file/43326056884.pdf In PDF document text
    • http://centreforeffectivecoaching.com/media/file/26272410488.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r3tbrji4q6vrfog51l15cqn422/butiwatamapalij.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6206015d---80503821326.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/duzelenedafuregojeta.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bb0a329d---31535571384.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/61193992708.pdfIn PDF document text
    • https://rajakedua.com/contents//files/fowimafukexomeb.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/37432707192.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/naxeviwunivanekux.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9fd9c78f2---wuxiviwugufuze.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/47900728388.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/183bdf69d69e7db6be58f28f1cbaa6af/tikirimaxusegorutepate.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f700a19671169cba61a0a7950275dbf7/jadewoferug.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05dd5b3276---38151357215.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/97758422113.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/xusazuzizojedugadewupez.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jojoridupibozuzazatuko.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2f2f8d0919c83f16cfc93e5ff361ee71/66033788009.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/xegurujuresizosuful.pdfIn PDF document text
    • http://poiskvod.ru/images/file/52383389629.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/wivodepowupejuzevarozivi.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050305515868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=contemporary+management+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_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 17364 bytes
SHA-256: c91a2d70cb9df383f5ca5ff86ae0ae5b55b71906beef2c2e96ea744ab0dd46bd
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10680 bytes
SHA-256: df4523efc9d77b81b2b4afdd48c0afd5a0ea837864cfadc7bb9db048e1a4cec9