Malicious PDF — malware analysis report

Static analysis result for SHA-256 239a4629451e277f…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 02:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e31eb773401c2b5ff43d6824575eeee9 SHA-1: 81985c5fce36dac0b978e3fd05a1bf3de63872a0 SHA-256: 239a4629451e277fa90c53a426eda2d87efde5ba5c74ad57bc254982e4191c18
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caaa762919f---sodevofaramejumako.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/td7ods6iokka1v7thgfbbr7ma7/8819087536.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160716bc7181cf---bemodot.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9c7a933cdd5141a23e77d943bf4d5c8/dikukababi.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a301271d6---womeraba.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a45562db15b---30932751066.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4a5a5558---xarawaritud.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607457d2359d2---47214290610.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9fre7fa3gjbo9keke3qrs5usnm/lewidiwujekifutaris.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fc2ac48e47317ed8a89cde61c7a6828a/mixovogov.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/8098810466.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4028837c4df171a9c293514d0d47ffaf/13299023293.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81f62e5b4d89af4202caa62c3a7ddfa8/66926039565.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b2fd64de---xanumiliga.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b066ed48d---9693309768.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608466c7e2fa9---60275412551.pdf
    • http://hornets88.com/clients/56662/File/71741511353.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/557383d02374bc9473b9c806c316f73c/4763179292.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c320de5---lewalin.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/e31sjhvv867o2kp1q3vhben666/gipujodewiwizoja.pdf
    • http://cobansut.com/userfiles/file/59097897960.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0343627f9---65776833131.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/281f4cba70a8256bafc162d7d5a5ada9/29511766308.pdf
    • http://www.odnpoznan.pl/fotki/file/file/timugipofowafexam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lesson+11+7+circles+in+the+coordinate+plane+answers
    • http://e1pl2.nazwa.pl/busy/fotki/file/rikagogonadiwagum.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_off0000e41e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 16792 bytes
font_01_sfnt_off0000fc30.bin
1015bdb950597e0cbf027807f3b60e738e4dde74cfcd1c6f08e1016a028ffa6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 17204 bytes
font_02_sfnt_off00012812.bin
6b83de3415c8a4315fd742cd367c6b7bf20477e04bb1bbb6d7ad62cf8c6632b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 10756 bytes