Malicious PDF — malware analysis report

Static analysis result for SHA-256 52db2d296367716a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-03 13:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bf7ae1727bb649d5e2e78de87ac5a72 SHA-1: bdecba6d61f3844550c84d8d6e010118c5536afb SHA-256: 52db2d296367716a754118f6b9f09de0da691ddc845689b9d8f7be0a8c9f5b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect the user to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=diastasis+recti+patient+pdf PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/rezobanofulazola.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/78211972772.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/03c6df08dfd08d07ca876abb67866621/52336958278.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/33082982699.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc16e72478e---pusevugopi.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/75679485197.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/69730582730.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zofigi.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/81031644854.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/niwirodigirunalem.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5f609665---70541522811.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926d7c81e0f---jenanulibelizirex.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/suwavusaxelagozija.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0be077269---10894587055.pdfIn PDF document text
    • https://preciseenergygroup.com/media/gopajugoxijipisajutu.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/6010960798.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/bebupifavigi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc963d69a3---54606695454.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a9a442a8---zutita.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6e55fhcqfbed8u68iie6q5k5sh/tujoromelibadud.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/sezuvideragogar.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/60483186675.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tonepaviwaguvevuloviribas.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/32980275925.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/60121106233.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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 15492 bytes
SHA-256: 66f955a0b25f9f002d75fde5af55fa991a89ab8d3b8f18a93a4ed80c409218f5
font_01_sfnt_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10448 bytes
SHA-256: 58e76d3230f099f04914df3cdd72d17860c58b5b6eeffd4dbb0e7439ddfc0dec
font_02_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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