Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9d01512ee334f1…

MALICIOUS

PDF

247.2 KB Created: 2021-06-09 05:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3fe0738797c063fed43030e7f6e22922 SHA-1: 23fee2256a6975ec557d74aa444bc8859e4ca7b7 SHA-256: 8c9d01512ee334f1f77363fc75a0f71bebdf798366461b1427d37521f4031b33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9319

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+many+legs+does+a+dinosaur+have PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9d364466---88268997950.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe852f34e8---35395171971.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc754a95296---futefumoner.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c3558d26---96597544928.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6652negaln6g4i745fo3u5k6ki/1720158617.pdfIn PDF document text
    • http://policylic.com/uploads/files/vamukiderafem.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec36a9a57c---futujaxizit.pdfIn PDF document text
    • https://tappowine.com/file/4677664870.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8a05465f0b6e1e366bfece0d0f114a30/76003715160.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/65928504131.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65491c085---nivadoti.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/vibosorizajaputowug.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2135913c25---nufixavip.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef753679224dbdcd846b461dff328712/dexobixokevosomozukumop.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/911fae5c28eb4064c399a788a7fd19ef/kobulutulerab.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813fb2c303c---44622311792.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/5f3ff8b7416763521ef128678b3cfc6d/funubakepebeluduguzoz.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab735e393---14394695054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000358ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358EE 4872 bytes
SHA-256: ded1c282ccc9db469ea0c225ff74e6fb23dbf4feef5a73ffcd1482cd06653cc8
font_01_sfnt_off000369c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x369C1 5452 bytes
SHA-256: 873bdd8915e1c8dbf60bff7cd986d13cbe656e724ee08c8f64397419c37c52e1
font_02_sfnt_off00037c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37C2F 1716 bytes
SHA-256: 423b883613f9711ee00c1af836fc994a935659a3d09d5020b64e4ef83e08fd98
font_03_sfnt_off000384d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x384D6 17024 bytes
SHA-256: 864c658bb7c1699d6c35525b12ba51f8e049c5db37f3bd46a144f0193f1adca8
font_04_sfnt_off0003b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B7ED 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953