Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d788a89b182191…

MALICIOUS

PDF

112.9 KB Created: 2021-07-16 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92f8128bc0679a4a956a894b5b0cd1f2 SHA-1: b4b0f19cc721c1deb1862090e4eb59d594c476e8 SHA-256: d8d788a89b1821913ab779d44cb7678adab9a2996ea8ec4e8dbee73c3073a805
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://babywagen24.de/userfiles/file/muzarixuxosularixagorire.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94191d7ea---kemikoxa.pdf
    • https://loctra.net/userfiles/file/76347681545.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8d7c42174---18882671075.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9153919e9a9e1fbf1dc40bb8015c173d/54591137530.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b663ffbc2e260ec3027bd71431db3066/75380895501.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/rejuwefulofipitejebexi.pdf
    • https://coonvalleycc.com/userfiles/file/begelojope.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/815a5d07c20f459721c293f6f99f600f/mofewew.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f23b4faaa5d9b56f8c226c96b078ffd9/54262950155.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wadoxukonoropezoliludesa.pdf
    • https://stratasphere.online/userfiles/file/26083615613.pdf
    • https://penal-garazh.ru/files/11497881610.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5cde60653aec693a4f29d75b6cbb118c/42099328007.pdf
    • http://innotec-industrie.be/userfiles/file/ribivisukujiwekugo.pdf
    • http://abimobiliare.pl/pliki/File/99759239711.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a850213009---17402938690.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e045b8961---nanujawegevapatejafunebez.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/7c133ea3079d5658bc5cf652b694698e/82384840550.pdf
    • https://baigiangtoanhoc.com/upload/files/solozetela.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/75985332215.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb1465d7e---juwebofizareku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=emotional+processing+scale+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015353.bin
ac68bafd491a23587f5920b1d5a5efc7bbf8bdbe24e4dd4e12f665b99990a2d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15353 19428 bytes
font_01_sfnt_off00018538.bin
e8f537b4b5cf0e8fcfe1bbee178f54b3224cc7831a3754731dea0d89120f3470
pdf-font-stream PDF embedded font (sfnt) at offset 0x18538 10948 bytes
font_02_sfnt_off00019e55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E55 16792 bytes