Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f4df8acf1e37eb…

MALICIOUS

PDF

81.4 KB Created: 2021-06-26 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1761a23562eac110995db776274dd678 SHA-1: ebf30cc65452cf5ac862862970fe5c7ac9b677de SHA-256: 08f4df8acf1e37eb80b62265fbb170ffb03069efee997f5515b0142e070f30a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings suggest this document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=burping+done+to+the+baby PDF link annotation
    • https://tecnibat.net/uploads/archivos/sokidavodefejuteviduna.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/35925101232.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c5c493be---69946910374.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6f89ce319d6723900b9dad8266f71382/33397761167.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d233d4942---mujan.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fejanepogifometusev.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce7b3867e---86024883348.pdfIn PDF document text
    • http://12shio5.com/contents//files/1737599392.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/23526913204.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tadejokosapew.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tenufagiwegazol.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/60236659001.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097900da77ac---rojufofasip.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/wedezasolerojezo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jovoxojojanemutu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1837282950823131321e6dbab66c1b1d/81762686471.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/nozatewowuderatipuwadujex.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/94nc3lrfju059ctpqnr17ehuu8/54580324864.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/60107462506.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c2fb762de---87590666002.pdfIn PDF document text
    • http://fxmeat.com/upload/file/1e3cf38cc4130c1ba22612924de95952.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609320f0a58d5---votip.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cff33808e8a3a83ac07e7873ddf6d659/8990992823.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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 10864 bytes
SHA-256: 604c25f1f05b9ef651ef04ae27131b3498d4e8123c7d50a6f2c505ac72646449
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16488 bytes
SHA-256: 85f08621e5eecad71843ea3dd3ad6b21f104a1a7c8881d57f086b406e41cfe28
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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