Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a21e0ee0bc4e12…

MALICIOUS

PDF

83.6 KB Created: 2021-08-30 07:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a2a9b7049824ee935f7bda9c8ee7333 SHA-1: eaf1ef667625eb448c4d759992613f8a8b06a324 SHA-256: e0a21e0ee0bc4e12587e321e25af63e2f6ebe0b9ebf3e40ae6c3710bd326deef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://jamesandsons.ca/userfiles/file/mawofufugibi.pdf In PDF document text
    • http://eko-inwest.eu/upload/file/35121393754.pdfIn PDF document text
    • https://ferropula.hr/files/95496562930.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/28455453178.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/bifedusuxi.pdfIn PDF document text
    • https://spacio.hk/attachment/file/90449379120.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be126b8a8---doteroxunijixip.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/mexizatopil.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/nawaziwon.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/48576776196.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160992b9b10d00---gozemomagowaladowogefurod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcaf3f2ea---guwuvefepaxawezoxedorok.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/3096677249.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263e53c8a7---94681865613.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/tawelexagujoxowodewazozer.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/xumabigiba.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/83144290496.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/pevanojuba.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3a479f1220535f9309265d67fcdc5510/vafizazipoxuziz.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1c62fa94---jafexuxemakabejibeninil.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/mowadowexilibipurofenak.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0577f061---disatosenif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=3+single+sign+on+servicePDF 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 10284 bytes
SHA-256: 756e4bab2d52a51f534d7dfdfbfc5b79b928b59f9052c5a2735093772be129da
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16964 bytes
SHA-256: 4da01dd11b45ef1f0c78ae1a95517aa14592fe7de58e061e727767c147a1c7a8

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