Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba561ab663a388c…

MALICIOUS

PDF

75.6 KB Created: 2021-07-22 22:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3629604e7ac9a3072109252d290d62d SHA-1: ff6ef283990cb78ce1c44ec0a847fe203d229124 SHA-256: 2ba561ab663a388c4cc12f69d635d09e021e683bc0580af2a56162d300712ddf
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://adaviestransportltd.com/userfiles/file/wusezojapamuvorateduforuf.pdf In PDF document text
    • http://jejuecotech.com/ckupload/files/pijebaxasamujakivuvufu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502110625608842.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/3444606342.pdfIn PDF document text
    • http://coumert.com/images/file/donurariwanixojebizem.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b1354a6185fd6e3bffa2ba39c978e17/63471454644.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/80768444278.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/34000203523.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e59f89702be7048731a05f1f81944288/44963327643.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/25765202248.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/28f0f8174e9bb9e02be1b0185c5de5c2/nogejujolorinazipuneke.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b447acf02c4---56108943255.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/jisupasugix.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/tanorijizu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e358869e01---279103820.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mewufakulizepizegoposik.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xabuwa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/dcd1bb31dfc454d7e58995e4cecef070/42786037428.pdfIn PDF document text
    • http://langmypham.com/luutru/files/rinasefa.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/89191689232.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/981211c60d79b89e36dfe97bfeac0ff4/bopabubisolowimu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d435771a49f---dusikejofepeb.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7ccdd3be---92123637139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kris+fish+and+chipsPDF 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_off0000c5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10312 bytes
SHA-256: fb15e0d0ff15f4dbb5b426053f92c6b99c96fa78899819745017bcb1b7425d6c
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17248 bytes
SHA-256: 4698f78a366b618fe2a8f880afd2edf0099b3fb27e497b0d71642c1ebbef43e2

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