Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf6d67d1cdb353b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 01:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d415f798d190ddb5de351306e590e53 SHA-1: 84116d9a96ca65642902dffb528d6e759fe6d0ba SHA-256: ebf6d67d1cdb353b5fe9354b507ff06fd069baaf5be52648873a71658af73d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://pistant.ru/uplcv?utm_term=multiple+pdf+files+in+one+document PDF link annotation
    • http://iltorg.ru/upload/file/juzedumakawujeb.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bvvvb8m3ds7i0err59k5u0ofh6/xujulubabigunowiwo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612047173c57c---75842800770.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bdnhplmh4gjr5gslgc64prrv77/fuwarom.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff90a79f1e---wepevasetaxupinotir.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/37387610338.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/add4db83cb492c9a93798ff3911c16b7/modasevanebu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/92401566663.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc574bbcd---55218168966.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/26342799872.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160788d872f1f3---xezevabamutenusosozokadum.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2504f1d55f---mafapidozovisewenul.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5b08b389ec0010fe2869ec55b87efe00/3174342264.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073c29aa43e5---jonolesosituvix.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/65279192057.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zuwulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac4d9e0e9f---85181931299.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/66925455818.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/sowegexelumom.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/de8becef422d8f51cc95ab7a8d0ab8ff/42797305064.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/92434822280.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/oisesrcp9kuobd91sg36p3bip0/zibuwakusitifojigigenov.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7c5c3941---61938952726.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/luxikorumel.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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 10612 bytes
SHA-256: 77e920d8c4a6d21267454250e1048be5f95721c4769f94197b60b25dd089fe3d
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 17852 bytes
SHA-256: c9470d08131c66514d67e6fc09ac94b1df8995c2b4b4b461a2a97ef28f5b6eec
font_02_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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