Malicious PDF — malware analysis report

Static analysis result for SHA-256 4053f36978d7ca37…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 03:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27960dc464affcb95ce96da3d239ef36 SHA-1: 92b71b3c7d4c33b7ace2de1a42bc543656901e75 SHA-256: 4053f36978d7ca37ea41db95ad6dc8c984b1949603e69cab6c16f920cdb51bd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=how+to+pronounce+chinese+name+ng
    • https://valubil.com/public/uploads/cms_file/cms_files/fotug.pdf
    • http://zzzwchem.com/upload/files/22755489003.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd020d523---titedekojipowe.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/jovijetaxonezofomowogiwi.pdf
    • http://videlec.be/ressource/file/lapinerupiwep.pdf
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608195244ad16---67155580030.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0tkp3qq24ga8c55kcug1ja0a82/43651938026.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/wedinowovud.pdf
    • http://skiflogistics.ru/userfiles/file/27543566276.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a054c48a74e---makinaxuvunavirol.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9m3t55hhhaef47drgabpp8csn7/4944447659.pdf
    • https://radekslodkiewicz.pl/files/file/96604558527.pdf
    • https://gemwares.com/userfiles/file/34207668356.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/potudaro.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f2564a3d---gadubuvetovaw.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ff549018---juneromubiponisefeg.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/upccef2ha800gle0911ea1r7i0/satewatib.pdf
    • http://sunway.me/uploads/file/010109308626.pdf
    • http://hhtaitung.com/CKEdit/upload/files/zazekosafudizeretegak.pdf
    • http://thunderstar.cn/userfiles/file/20210506172118194698155.pdf
    • http://esipro.lu/userfiles/file/49254883668.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160790ca1dd0cb---siwoxejijixibeleba.pdf
    • https://cordovajewelry.com/images/file/11193845013.pdf
    • http://szpk.hu/_user/file/99356598664.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9dfbfe54f2e35d405bd3df84982eff9d/tamixavazexafozejut.pdf
    • http://eugeniacheng.com/wp-content/uploads
    • 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_off0000baaf.bin
712522a5dc09310a6496848cc807b537bdabdd92a9a0815e95f80ddf9dc94374
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 10952 bytes
font_01_sfnt_off0000d3f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
font_02_sfnt_off0000ec07.bin
01628946f46f09db246fef8a3879d19d526a1ac98072a1961b7fdad35762da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 15360 bytes