Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e77e58bddfd713…

MALICIOUS

PDF

92.1 KB Created: 2021-08-06 10:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 68a768dee96083e3cdabdc56f919e6ea SHA-1: d57ac05adbffce5142bd23daaa583a0039f2c396 SHA-256: 76e77e58bddfd7134f250b3726bfb06e9a74649809b1ab1fa829294d0700ba55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9990

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://medvor.ru/uplcv?utm_term=solucionario+matematicas+2+bachillerato+anaya+aprender+es+crecer PDF link annotation
    • https://psychotherapie-coeppicus.ch/userfiles/files/pudojugukixovoxaneweva.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e65186cb8---95016495797.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dcp5ullkf9245cv2uc3di85pv4/wetipenaluni.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/96471322528.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a2fc07f4---38370043582.pdfIn PDF document text
    • http://wsm.hk/images/files/12279866688.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s5j6teg26788lf7mu3b4v56stp/tanipizepajudidibu.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/83898875372.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1e71666919863bdabcd4b1a9c297bd64/30996139418.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rodepavizijugu.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/3138599032.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/21752428347.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb98acc778---kodogenodiru.pdfIn PDF document text
    • http://isgsrl.it/images/file/lifuwefufo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e3ddc7444ffce7ce809f56075560c939/35430182778.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b9e7e1631---tojiravuvokixen.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/22586116811.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/benevifivu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/bajumupiranenomonobo.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/tuzuvobafoxixo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7be88c82---xiluguvekudogas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 17628 bytes
SHA-256: 3e95244afb0d9c8074dd81eef105dc68ae945f7791cce0db4405fcfa53f17467
font_01_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 11328 bytes
SHA-256: 939b65a50c19901832ed538e2746890226ce8a2434060f3d3fe9b51340c16245
font_02_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_03_sfnt_off0001497c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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