Malicious PDF — malware analysis report

Static analysis result for SHA-256 44226b8b638d8a30…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 22:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 253f9b8fe5ffc1ec4285d87c658e550b SHA-1: 933e46d53380615b7f74726ac9ae34cee91766ef SHA-256: 44226b8b638d8a308a9e6b6e2e5d651adce0af4572ffbf7aa3685d3540b8d8d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, likely as a first stage in a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ba67dc49bca8c60d8bd4bc6b7ccef422/nosenaw.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079616c0eb74---85339071072.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/343e7f6f9296513aff5c3353ffe0a571/85901370517.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/55029280624.pdf
    • http://scsytech.com/upload/files/warudoxufekodamelirenusuv.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb396c3c9---zojipozi.pdf
    • http://risorsaterra.it/userfiles/files/62362607436.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/maxasaletipopojelirazuv.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tshl50lld42tc7tu0dvhmdrkbq/49624176255.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vossvefug3t2oet7jgn1bq00m4/rojorenamufapuweden.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/baxun.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0cadc7959---53081742672.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/29cca59783f645ffae4b581032eb9fe9/getomenelekawevates.pdf
    • http://tinhdaurosa.com/Images_upload/files/fikigorit.pdf
    • http://teenaramainc.org/clients/875997/File/99079237652.pdf
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/xupawufumazabosaji.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6gqupjk0j6et3van43gvog43gk/32005083334.pdf
    • http://webursitet.org/Files/file/99779614023.pdf
    • http://ks4073.com/file_media/file_image/file/59324780324.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a838bdf2f---40386976895.pdf
    • http://onlinecommerce.bg/uploads/pages/files/54562488603.pdf
    • http://files.ibiza-ferien.de/file/76420217712.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa37222a66---nanuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=instax+mini+8+manual+troubleshooting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d6.bin
c2241dae1d2fbdb33d80b33ae197b1e96ec8c799ce44c66aa7466d570904041f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 18224 bytes
font_01_sfnt_off000111a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 16792 bytes
font_02_sfnt_off000129bb.bin
3f07b2ff45ec7e7bc6d5fc611849561f9a05d1552de9f3f6f0cbd7861752c2fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 11056 bytes