Malicious PDF — malware analysis report

Static analysis result for SHA-256 adee4c55eb91cb56…

MALICIOUS

PDF

109.3 KB Created: 2021-08-10 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d45904fbfc8eee7ea2e192dd0f88c28 SHA-1: 865ee6a7c9f9778528983ae5dfc7671eb97133b0 SHA-256: adee4c55eb91cb568134d2d0930c649b032c66cbaab54be9e38bf91d50b1225e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210602205051.pdf In PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/40270515375.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jojaxemotajupovobugoxo.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/tuwajidukanizekupirika.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fosikisolipemefujaduzim.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5945cde451---76429126780.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35dd22d1d---99368509213.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8390a446e5---25295024135.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/32660598822.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736061be78e---tinirosedazatideto.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/66387140084.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df6ab3277---55355934960.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/sgq96vhk5l5h17opjsm8m6oib6/rerivokusamudefizopitore.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650bbc16c2---2582950416.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7376879127---31951148638.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2baf84cc0---33850664531.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/likevavijalutagawo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/op4elgcjfauv413fsbkhqvia2b/55355363077.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/62825168199.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/gamokegatodidogasokaxal.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/93412657073.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf4afbb878---65851760449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+are+the+medicaid+income+limitsPDF 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_off00014847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14847 17616 bytes
SHA-256: 85f3e7195d381cfac989cdb32ba7859624441cb64acf0980e28eff32c19da51e
font_01_sfnt_off000176bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BC 10628 bytes
SHA-256: 3208b554a8980512f5b028b2f51678ee80c1d3d10551e65d0623252bae2b759b
font_02_sfnt_off00018ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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