Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c50bd3c0d6bb61a…

MALICIOUS

PDF

90.0 KB Created: 2021-07-06 12:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ad3747eabb2dc3cb8cca745e93d5e0c SHA-1: 38af4db86cb16ff9350ec7a4f2910324f325ad39 SHA-256: 9c50bd3c0d6bb61aad83b3982df2c6373ad85776298d7b5051da36d505faeb88
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous PDF links on compromised CMS upload storage and disposable hosting further supports this assessment.

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/caf2d4b90ff63c652d92fea4dde61eb6/31295586557.pdf
    • http://palami.by/images/file/58483533306.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ddedaf36d7acb61e0c65066671f219b6/bizisu.pdf
    • http://petra-dario.info/upload/datoteke/togosuwutabixoxirinij.pdf
    • https://telenovella-bg.com/files/mivasevarituzivej.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788a18a934f---23567521743.pdf
    • https://unosms.us/userfiles/file/65230903148.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/83858852829.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7cfc1f0686659bd15f5caaf82a3b59ed/3754791680.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1tkcg0jeg6u9427icoqcn5j5q0/negino.pdf
    • http://brandiassociati.it/userfiles/file/8302142711.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6b7e253fa95039d3cf13769e4a8a034/bazizanobuxasefoposa.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f25f1ba790456307e8cc3414c8191c12/zelukokozezewona.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d189422a166c89c2579967afef80faee/jokomowagojeresigovuj.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f0cd5285eb2b3e464b6d07e5a78a20d7/63307521184.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c636d90ed2---3113852151.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/bitesuvupobuwer.pdf
    • https://alakharia.com/public_html/userfiles/file/revona.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08a584ba2---lifidebi.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u6fuj1lt589eda45jh2cmng707/4492363845.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=good+font+family+css
    • 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_off0000fd13.bin
6a6d9fa040b495c90a429afc7e970c981e89554b88a686dcdaaa5720fe199b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 17892 bytes
font_01_sfnt_off00012be1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 16792 bytes
font_02_sfnt_off000143f8.bin
c898a8b21288704fdbe52ff2b8747f07c918960344c3868aa45dc72a5a51df2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 10556 bytes