Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecdf38aed3fc7b0…

MALICIOUS

PDF

90.9 KB Created: 2021-08-12 12:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f673951ec1d29a073b54b8d4ddd2b044 SHA-1: 1d7e8e834fb15a928679c1bbb5ab0af325a7375a SHA-256: eecdf38aed3fc7b0c69660af8ce1bf5211020963a3568a7a3bd63121ce819875
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://61kidsclub.com/userfiles/file/siserirebotiwekesokuk.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6abce8b4---56185183784.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e0135e33a---begetejepoxoliwalikepi.pdfIn PDF document text
    • https://bselink.com/userfiles/file/18652948479.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/89287212597.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c928b8687b---podupokamadot.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/fewuruwumagozekofagiro.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/puvos.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7de39d66---dunaxomebomarelejenola.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/5748798971.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06fee4432d---bawogamuvezorap.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff39dd2203---tuwagopilojubitab.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edc40734949---2135448417.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1627653387.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/voledilox.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16114207485dba---61452996002.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b6b4821620b646cf8d1d95d5af20fbd9/95984423693.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/bewuraw.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jaxizeguxoxuzaxagoxafi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2a4353e---51142127996.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/decaebb52f2b9e01f6bab2be1280cf50/naligeber.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/lareweb.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lapez.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/64014678317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nuwave+brio+air+fryer+recipes+chickenPDF 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_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 17276 bytes
SHA-256: a2ca7480730b71727f4663b1f234b9d84baabbc6fd7e0968922f1dec6a57f0a7
font_02_sfnt_off00014356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 11008 bytes
SHA-256: cd2bac8fce9925c04f53b20847a451911f78f63da01b1dd1bb009577c2aeeec9

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