Malicious PDF — malware analysis report

Static analysis result for SHA-256 8733860b0033c3ea…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 14:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bacee860b39d12395452d4cf5eb6e775 SHA-1: bee78df6eefd73880aa0f89ec0f9a629f02dbcca SHA-256: 8733860b0033c3eab20a7078909a7030c6c44b90d852d9e27f813cf7b5610047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The primary goal seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://lapmaymn.samdigroup.vn/app/webroot/upload/files/wogexim.pdf In PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/kixirowoligitawumatu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615005506a6fc---56124605653.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/babajopegifumub.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137561ecfa2f---85639878266.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/juwaxikutogop.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/24305265190.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kiwosifedenowulepuzobo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f29db5b583---nibakodatezixasofaduloni.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea0691c3f43df3fff07236c373950373/janisijififemat.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2962c5406cb37812b975f28436fc4f75/xotinitazi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b03b90b6---koxasikam.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/78797751749.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/jajaxabazinesonomag.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6f80f3c6e46f537e106fa8d59dd2be91/35700191100.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/gaputasavetitamoxopuk.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/9823287959.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/99325952031.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fiwuveruto.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/84819452450.pdfIn PDF document text
    • http://wwstationery.com/files/file/wajojifiwufenox.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/93161802257.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/befawiwibekew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+y2+new+update+miui+12PDF 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_off0000ae68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 10636 bytes
SHA-256: 1813a877f07421737d220e60936834d59b7f5d85fb9cc70dd61908ff0a8b43a3
font_02_sfnt_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 14580 bytes
SHA-256: 25731ee0bb3ee939fe9e691eb4f2ebef50c2f96c146fbbce9f99e0b3173d6e6c

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