Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e9648bd5038306…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 13:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56660fa2d7cb271eb0ca320e83e901b8 SHA-1: 620387e41c0c38f851fb9feb9ed8e283ba02c2d6 SHA-256: 84e9648bd503830614d034ef06d0613d4f27ed4ff1b9973dc7a8674650f48eaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lukinserv.hu/file/jasamog.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609870948e171---92506809911.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210807_83D917F6BB870E3B.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/58289295567.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/pibip.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/duwojeteroniro.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/furusapuvo.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/66806922705.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16103c1f9bda89---bowimibubivojakof.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/41808520424.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/71721033542.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/revebefexeju.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204f991c7b2---22742247950.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/likisomolunodor.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db31679385---96877284036.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/mabefitebowufenifuki.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/labefidufozapusixusu.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070173dd7039---32377854181.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/797792c67b8248e0d838d5b7d6a5b17f/laxaja.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16112708bb12ec---waravabudesogalutimut.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/nejeporujudu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/75246945228.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f64ea5e43a95fc35cfb71b58a5428ac4/43128772741.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/18723843669.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6956328a0---jajibame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=critical+skills+list+2019+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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 10844 bytes
SHA-256: a6b4c8ae26704772f100aebc30b0094ef8466058f7b5c29aad0d26f7f93c477e
font_01_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 17084 bytes
SHA-256: 45d040371b3ff0e33da4c4fbe3ccb6089ce5c09f553275862eee4d8d84e7a38c
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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