Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12c4299fcc890d1…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 13:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39a27fceb36c0981a29413d79d7f4757 SHA-1: 12abd1403f64fd0d1d29497d1599c8dd4a18d2f7 SHA-256: c12c4299fcc890d140ee42fe5eb2fd18f3505da49452ea6f4c6a49e7b4c1cb9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=wall+e+pizza+planet+truck PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ec4bb3f2e2b18fa73af2d8b7d30374d/49692523720.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/582628657.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/gimujuta.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98553183301.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/39584531451.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed867cc20---69010071103.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/sogumobozuwukutadojo.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/63292983677.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083f45b2dfec---15017181373.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c4mm6bja1v8lj7tpd3ahobt2v4/5580828231.pdfIn PDF document text
    • https://ecoretras.com/file/jumiralanosawosuwo.pdfIn PDF document text
    • http://cl-pub.com/files/files/81316073840.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e9437d8a526005b210a5666f8daacb70/zavugixomezuti.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064ea2893b---kurokigijijukibibuguro.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/xorefewomezibiwediru.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacffb13a99---gofuz.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xijipanegusop.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e1e341b674e89b0b47caa2efdbea673e/29471726464.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/89310905115.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/56589975166.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac9a7a30b---renexif.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/lageziz.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tizosagonidemaladesoxozu.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_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 10324 bytes
SHA-256: d7e022f301f226192569eef3d14eb61ec2f85c3e7bb5ef8a462c5ef03aa624a8
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 17872 bytes
SHA-256: 5d874fbdd02d507cda81fe5f488018c7a30a9d148fcfac42e5eb551c638a10c3

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