Malicious PDF — malware analysis report

Static analysis result for SHA-256 11489f4c5920222b…

MALICIOUS

PDF

89.2 KB Created: 2021-07-07 03:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5164c1a86b94604d1034968bbd316be6 SHA-1: 293de06e1b9f2812b63c3b0495693d0a852a4e12 SHA-256: 11489f4c5920222b21dab13ea3964683f5caee81ccbab42e9bbbb9adb6e61267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm implies the PDF is designed to lure users to external malicious content, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coastalstudio.com/images/main/file/86509188922.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b95007a4---kejarogezuperetesisaduta.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/20209716649.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/31341848952.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/837fa6c71a9c8f1af03a40845aeac82e/dusosejovonokumo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/56dbd09f3bf5cc7cc14080902fb3e883/wovogu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062219142435.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9d81185556f589862b1d2989b046048c/67072501511.pdfIn PDF document text
    • https://afayl.com/userfiles/file/ropizesozelidefuvagus.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783a83a7fa6---80589260595.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/1598748393.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d63057831a6---povogapibunajibove.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/vidubigamajafegovuxes.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a1ac8ea0---11230349370.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-16/20210616163007342219.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/nukiwimape.pdfIn PDF document text
    • http://huiking.cn/uploads/file/201752035228.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/15266827160.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/kuxutivopopejonoxasavum.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d353de3361---2988273889.pdfIn PDF document text
    • http://zubrcup.by/files/files/vuzose.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8dspjmhqn0c7m50ar9hitsi503/gajopav.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ffecl28vcstkkkl3de0jgsk3i7/kukiposira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=modelling+financial+time+seriesPDF 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_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 18096 bytes
SHA-256: 36f065b96a664a3255b157ff5259cf2edd977649e731b1f47e26567a7ab6e2ab
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10812 bytes
SHA-256: 921a339f527ca54c590c81fe387f458932ea4c9e6ffc7d51aa06df59efa84596
font_02_sfnt_off00013fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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