Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab882bd344e12d4d…

MALICIOUS

PDF

77.2 KB Created: 2021-07-22 09:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 641b8a3bdd3e49c4586f46002970311c SHA-1: e8c8f1842dd3839e677b9dd33b8bb2bf812275aa SHA-256: ab882bd344e12d4d12772e4a9e78f42d8c2b96fe3b18b83524c3997f1510e396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iscuigsv4oq71onokpcsft3kl2/nexonaraninobax.pdf
    • http://ponyomaru.com/files/files/rulop.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/67900490650.pdf
    • http://nhs-carpediem.com/clients/46367/File/463975633.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54930eb79---86724699828.pdf
    • http://hoanggiaphatstone.com/upload/files/basewupubu.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/a512qra383elpl276o0nrub5ru/lepuwutoweraxedimanikipa.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ae7amgsdidbj632kljjjudq1v3/rekozosaw.pdf
    • http://ty-int.com/files/files/kokuxorabozogixal.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f958b64a2c---52831886910.pdf
    • http://asijskepotraviny.cz/files/file/86507969727.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736159c9cf2---supunotigi.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/43d04aa915b22dc8d7edd2afe1dba7d2/gobofav.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e8b27d9f117d15e09ae3e4e70e62abe3/62547428577.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8562504fa---96061215413.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aq9pu7fpeso7v3svmjvdqgrpc6/14466760099.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e246c1fb87---kunaduxigakogariseda.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/j3dfuqbd5raks47s18dfqj2mr9/42752157758.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f6068707f0085e3d00d9ad467ca3608d/65074887479.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d142ca135c---57351165652.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609aacba379b0---62291582459.pdf
    • https://ddshower.com/ckfinder/userfiles/files/94464312433.pdf
    • http://lpsa.cz/userfiles/file/55741184529.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/063aba155b0c831796b9d675033970fd/39279898969.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6334ba28f66d9c558fa17a5247e18638/fegikidujawadezupino.pdf
    • https://eltonltd.ru/sites/default/files/uploads/webowefuwoxubumelorev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nintendo+switch+animal+crossing+cheat+codes
    • 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_off0000caf9.bin
ac0eb41b4957ab8459d6476bf5a847f270254d4dbb5afd0b0a7afd42354634e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16592 bytes
font_01_sfnt_off0000f610.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
font_02_sfnt_off00010e27.bin
d7a526601b43e8e259b9a730ace954c84a88ee056b9f7ff3651c876cdc598fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 10880 bytes