Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6de78001945774…

MALICIOUS

PDF

67.5 KB Created: 2021-09-09 00:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41a139fa72a142767ecfe80ac8e2df9a SHA-1: 3281c43990035a16932cd639f2e0cedd0f287158 SHA-256: 5c6de7800194577444468ce25e265bbb0d2c51e9dbe292dd966ceb59e3716f0b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs, while some are marked benign, are part of a broader pattern of redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://de-ko-gmbh.com/ckfinder/userfiles/files/tewematidewifu.pdf In PDF document text
    • http://eot.mn/uploads/userfiles/files/gatejurifadopefupenaposow.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/60643521888.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132982199e94---nekutemaziwoluberesi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161361ded2a24c---71357451353.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613334e266af8---25354551072.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/fugubon.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/83985558570.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/litozebixadoxedunali.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/4313440039.pdfIn PDF document text
    • http://vipdiler.ru/files/file/vexideribiwe.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zukuxateku.pdfIn PDF document text
    • https://turbooto.vn/upload/files/xomidelenumatam.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/18604301180.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/71866999564.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090311594690.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/64723408573.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/xipivolexorabibarir.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/gotebomisefo.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/51195797933.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/megifogavovat.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/popozakube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=imovie+for+android+download+apkPDF 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_off0000ad37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 14396 bytes
SHA-256: 3d61ccbb486e300fccacb1bfe58189f8553837e447be2e8d11749edd7aa8eb19
font_01_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 10588 bytes
SHA-256: 9bde0146dda1196b2693caa38c26db2a9d2b47e530800e80fa36e6a907999b08
font_02_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1