Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c057adf00d8edb3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 19:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d953e1e1385bfb2e374690d8bf8b300 SHA-1: 76588ab70d379283ee26ddf7b113fb433aaea7a2 SHA-256: 0c057adf00d8edb3717b9edd1fb768a84a6eaeb9501b2374140f334c0df2a3d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The structure suggests a link farm designed to obscure the ultimate destination or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eghamatkade.com/basefile/eghamatkadecom/files/wododefikunojovofukokunu.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/90589352434.pdf
    • http://pttaccounting.com/userfiles/files/36051548090.pdf
    • https://wedding-photos.cz/userfiles/file/ludebipuxarifosegif.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/1364166333.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/60715283910.pdf
    • http://parbatsamajjapan.com/img/files/files/difot.pdf
    • https://bodegoncriollo.com/userfiles/file/90139825327.pdf
    • http://www.binghan.my/userfiles/file/xirozamunofumebavozu.pdf
    • http://orenprom.com/img/account/file/67586615105.pdf
    • http://abpjse.news-read.com/upload/files/42971115783.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/80118620738.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f531fa3e---42639768565.pdf
    • http://opusincertum.it/userfiles/files/71032079688.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a736b1db---60976264269.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd9b29928---bufopiwa.pdf
    • https://sapporomn.com/userfiles/files/96516111477.pdf
    • http://bioident.pl/photos_fck/file/dafusakugomuf.pdf
    • http://mgrima.com/files/file/voxotibawulelibotaramazik.pdf
    • http://avvocatogiuliani.it/userfiles/files/sinozasuwekofowo.pdf
    • https://exlite.it/ckfinder/userfiles/files/93717623380.pdf
    • http://thermocomfort.ca/userfiles/file/68243413337.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/62ffe05e4faab0a4ea23c65b7af4c267/kikuxoxazitaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=maximum+rate+of+change+calculator
    • 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_off0000b1e6.bin
ace7e6892542408e8edecdc7c78f1e8108702b97a48affa088c7a1b12ead7749
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 10812 bytes
font_01_sfnt_off0000caaa.bin
e9039f0b962c6d3dbc3bac6f79b72ffffa4f0382f569493af3b46dc724f0d433
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 15324 bytes
font_02_sfnt_off0000f162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes