Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b68bba28335ded…

MALICIOUS

PDF

92.6 KB Created: 2021-07-18 19:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 296fe513af5dc4e1820399ae7d94274a SHA-1: a91088ce684b9fd30cf4c9bcfc756c2e29bca9fe SHA-256: 11b68bba28335ded16c378d4764cab223c993fbd6a5b14feb10d67daa49d8ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also flagged for potential exploitation, and the presence of embedded URLs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://towa-aaa.jp/userfiles/file/58033172354.pdf
    • https://ksuskalology.com/images/file/wakoduvawolesavulo.pdf
    • https://sgotomotiv.org/upload/files/senovaralotodekugowela.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/576c453a6a1c729372cc0c96c883c35e/jafuvas.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e1edd7a4---82886883099.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/217998c28efb5195ca6c7b2acb2837d9/kufisovujofopoxosolepu.pdf
    • http://engroupe.ca/aym_image/files/bosikifuwapelewo.pdf
    • http://thegroverestaurantnj.com/userfiles/files/83515463617.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608087101c7f9---dabefelelab.pdf
    • http://aeronautike.com/userfiles/file/zekidotamizomavut.pdf
    • http://nedirajtebosnu.net/userfiles/file/nolupetutixosazosod.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/20440697651.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607802be415a6---10081785496.pdf
    • http://healhumanity.foundation/userfiles/file/98983599386.pdf
    • http://thsport.dk/ckfinder/userfiles/files/10507330425.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f9f010c74a50a5e91886081067560e61/82419424746.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/bukazoditozobemuwexes.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e16b6373259f34ac39469a7abb4fa880/wezabowipejaruwizuw.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608038e1b3392---15138890214.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jokbddcgis2ahdmg4a6cg3hg73/dakujuf.pdf
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/48995502336.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f436875d81f283999c7f694250eea18/bamomus.pdf
    • http://humanitool.ru/userfiles/file/6210791284.pdf
    • http://aainthedesert.org/wp-content/uploads/2019/02/1-01-Introduction.wav
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=twelve+steps+and+twelve+traditions+pdf+free+download
    • 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_off00010635.bin
db84d0b637caa00a8c487ceb5816d691dd417d70920642820eaf9d0760fd7937
pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 10604 bytes
font_01_sfnt_off00011ea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 16792 bytes
font_02_sfnt_off000136b7.bin
d372cee76a090c1571d68edf3d2ecf1890286524ceb9b1c0af26e7593b5c2760
pdf-font-stream PDF embedded font (sfnt) at offset 0x136B7 17764 bytes