Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd6bc8f071bc8ab…

MALICIOUS

PDF

69.0 KB Created: 2021-09-02 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 282cb75e74930d0c2ef4dbdb347f956a SHA-1: 6cb512535e3a17e7718eb038a38d52cc1fd42cc7 SHA-256: 8fd6bc8f071bc8ab42c61515bbad9d72268bafe1e818d17f5072e61d6043dbd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=tuttnauer+ez11+plus+manual PDF link annotation
    • http://alimentosldm.com/userfiles/file/15231724598.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/zomonuxikigoxokolup.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/96400450193.pdfIn PDF document text
    • https://nasikampung.info/contents//files/wedabanes.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89875ec8fd---fimasedomelitofu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a790edc34---17645255571.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713efdeb904---kozavuxejisegadid.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57778e99---63986288099.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/gapuvutotido.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/33809824695.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/93791622385.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce613a5521---77188225714.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/53476405396.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/gosepisoxo.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/24680835512.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/xirowupiwizuduw.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f6901019---nezeladasexuteji.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608593e1831cf---xetusufarodinixatulakovu.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/patojilujexunosef.pdfIn PDF document text
    • http://idroter.org/userfiles/files/tixuziruger.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611c38736e5de---3789777692.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1ceba117---81335687526.pdfIn PDF document text
    • https://manenshop.com/upload/files/xojesoboxebejis.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/farelekotofez.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/89673880248.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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 14268 bytes
SHA-256: 3267c9fbe117f8bb9778c4d9465c63f40c52fd59bda228b411da7313b26328cf
font_02_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 10376 bytes
SHA-256: 7eb62a0c591734e38e517f4b21f03f3195b7021eda6d7ddee34a0d1b3c9512db

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