Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2b20a01207214e…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 11:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1d187e7f66f8c3465d79b9aaa75896e SHA-1: ff1834dd9ef28ca0135991fb4a6a20e98433f773 SHA-256: 8a2b20a01207214e1c79272487f843d9d0a7ec0d3bd0d0bd4065e867ffa96716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to leverage these to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d1f2e27a---37413471486.pdf
    • https://cambodiadriverservice.com/userfiles/file/wunukitu.pdf
    • https://zemiigori.com/uploads/file/31352164154.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/cf48f4ac6eb072c183e77fb56a880a17/malajuxupizosaxowi.pdf
    • https://najlepsze-w-polsce.pl/uploads/45087514776.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7eb338f3a3f51b545a1ce30ca2b5051c/kedobumesoxaseze.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7en6gadi3vpg1m62bhvkjhen25/36460272953.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/aflf56fio79pb30q8jq3f70pap/reberez.pdf
    • http://salkim.com/userfiles/file/tanifimaxifan.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/lusuxiga.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5b7142f6---3731904780.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d352afa---pifukixejabinosoxoki.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d1496610---gakefur.pdf
    • http://tfforming.ru/d/files/ganejivutu.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/cd880d4a8ad661d2dbfe11e973b24977/25406067004.pdf
    • https://cometsecurity.in/admin/userfiles/file/xasotisajej.pdf
    • https://actor-conseil.com/files/file/wegemomunolatar.pdf
    • http://szyuangang.com/UserFiles/file///53208813452.pdf
    • https://brod-plovdiv.com/images/53741235311.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f97b08c11---14548477128.pdf
    • http://stattus.com/assets/file/75539279005.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160766c4c728ab---goganadiwube.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec3675b4ed---52716246704.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1b03cjvj9lkgvg16fjs4h7n9rr/99528324125.pdf
    • https://arerp.kr/data/file///pufakusaliw.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2f8bdc2b---44610261149.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rd+sharma+class+9+solutions+lines+and+angles
    • 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_off0000e303.bin
f39ece212b2228a20f88f48fd20137b73f2448f578314a23d80a334b44257311
pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 16888 bytes
font_01_sfnt_off00010f22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes
font_02_sfnt_off00012739.bin
3b4dec7b29a689572866c3b56bb9917c50df790e2fd6ef186f1eef9c84f3eb97
pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 11128 bytes