Malicious PDF — malware analysis report

Static analysis result for SHA-256 793367e3554df955…

MALICIOUS

PDF

108.5 KB Created: 2021-07-07 03:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2799554eeaeb1cd90c55b9c7ea73a495 SHA-1: 9c27c6a76fd14cd03571d2695d4832d9b72e679b SHA-256: 793367e3554df9558586c4ecc4e1d5dafd13168ed1405c9b06b07950866b016c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to other PDF files, many hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phish users. The primary attack pattern involves directing users to external, potentially malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://bomberosdenavarra.com/userfiles_nexo/files/98570312741.pdf In PDF document text
    • http://fipjp.com/userfiles/file/vimuw.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b709be5a59730ffb81e31ad46504f7fa/78048533397.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/41603083799.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cec93dd4b14---pexesevuwosavafag.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r37cb4c57v5i8h7rolk77ee5uh/21086481358.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/85572330605.pdfIn PDF document text
    • http://stevis.cz/files/file/73644577918.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/89766827984.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d506e4d0bc---653679929.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c221c84754561e78e8f478fae415594c/95094342158.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/kabepimutu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f945a79f89---78079573742.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/162830916560d7892c87dbc.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d36d2e61f---sudoxibogotulogujo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72c8e579d---wukesumas.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/derovinopi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd60e7c6cf---lufovelagodesexuxavopade.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/5c5eda333b77875f62236e74fdc9349e/kesepur.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210525/2105251514002714306v6w2rgf0vzm.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c24a619842b---41664088636.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62323c5ca2.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/widop.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160853ca95fcb7---13565387157.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5b0a8b7c0333a6df48403df777d68ce4/nefivukexalaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+summon+a+guardian+spiritPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 3000 bytes
SHA-256: 12129404366174d0f4131cdb70dee1a3d72a8ce29bb7cafd641618cd8713eccf
font_01_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 17660 bytes
SHA-256: b8718c365016ac0035d85e36fa32163a9135c3fa095e156e6622761ca242c346
font_02_sfnt_off00015c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17454 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off0001899a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1899A 10736 bytes
SHA-256: d768da5383a2fa5239a839958e7f80f11fcc3bb272ff11237ae69ade4b6f70bd

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