Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aca3d03aa27c7fe…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bad5e1df480fae3de19b4915278dd302 SHA-1: ee24f172260f9edd5197608928b40318bdd6cce0 SHA-256: 4aca3d03aa27c7fe64000f83fd72d24ee6e8873aef955f233be06e53e88ffa15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of numerous external URIs and compromised CMS upload links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b01f489015---56777375154.pdf In PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/xaborerosadisarazi.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/64974622592.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/35843470290.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/76008365081.pdfIn PDF document text
    • https://kawanmto.org/contents/files/33348708298.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336f56df490---jopedomasu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b2a9d0699---70341679979.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/23793576127.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/32858932532.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/91610453863.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/dexofogamoxuxemezu.pdfIn PDF document text
    • http://runo34.ru/attachments/file/21829234345.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613192fd7b4ea---bidusonaraxax.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/33779086051.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/25438519757.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/78378997662.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/68793051146.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/gigigunirajepevazuve.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/banamawefixolufen.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/17804224278.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161327d601cec3---39142205496.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/benixatogimifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=boruto+naruto+next+generations+ep+120PDF link annotation
    • 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 18604 bytes
SHA-256: d1a601fc228d359c797413cc67c0af9e8e8a77ff0478671079b1aa81aea94688
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 10932 bytes
SHA-256: adfc6753711a2bc06afc935d09a3bfcc41eccf568c6f883854553bb1af5e8788

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