Malicious PDF — malware analysis report

Static analysis result for SHA-256 81222505c99a8ba5…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 02:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cacdb922fecdad5ae8de9fd19cf85c7 SHA-1: 0b86dac230d187be1fc3ee0eef1eb51a6053b8b4 SHA-256: 81222505c99a8ba506be58186bd63a956d3304aae2955b554a968bad22ac6225
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6e81af18---rikowetebafemuto.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b7cdd9cc0---jurabuga.pdf
    • http://meadescafe.com/userfiles/file/56207312889.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f3aba49c571ce860cf25913d28b92622/lukumifuji.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1586514b---metajewafakipalilixur.pdf
    • https://majubesar.info/contents//files/55703292921.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/969cc6cae213a325b83e0817f9d81418/11266345555.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a1f8fd3fa14e57c5496f2e9b50048b1f/9446013817.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0af46364bb9349766a92b5b30d722c07/7457734337.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66740555984.pdf
    • https://oklogistic.lv/upload/file/26096848455.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/10911905180.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607197382573c---48903881045.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9ef5098583a0b09f5913d220e9b49b23/geket.pdf
    • http://austria-ex.com/images/blog//file/jilikukuzo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cf040430---269535700.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/tovorajujus.pdf
    • http://jjmcp.jp/userfiles/Image/file/77463982149.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2jhmcs9mj9snv0gpn1scsdrq4f/63709576588.pdf
    • https://morabia.fi/images/file/27978114773.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f8df1952---wuxitulediwiwog.pdf
    • https://beautyyaurient.com/editor_upload/file/86238436835.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a1a4ceb74711190dc54df5f0727fc0b3/jatotoxixasaruneje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=father+we+love+you+we+worship+and+adore+you+lyrics
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb7.bin
103825e2b489d88296c7340d40e0970674476840633b8839b1556d6d51418637
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10956 bytes
font_01_sfnt_off0001081e.bin
e449c39a01ab020490e25380c0380e0ec758c3ef318f7a1558bb3e2073620592
pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 17248 bytes
font_02_sfnt_off000134e6.bin
33756c9e2186b551a4923c4ee74b1a59b8a3bd47b7b46c4f184cdabb61a2b1f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 5988 bytes
font_03_sfnt_off000149ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149EA 16792 bytes