Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94e6bb2f91dd7e8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 12:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b9d79f53d53510b4d7ff3c9c46b3b55 SHA-1: dbf2171634c83664c2eeeddeb4b1503f0e6ff22f SHA-256: e94e6bb2f91dd7e891581bac1a4ae62ed47ace752e0342c85fd4732dc92f1fd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to facilitate a password-protected archive download. This tactic is commonly used to bypass gateway security by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fincasotilloviejo.es/files/sotillo/_repo/file/7318280397.pdf In PDF document text
    • https://deepankarbasu.com/FCKeditor/file/wumeritopigixedexifu.pdfIn PDF document text
    • https://keongracun.org/contents//files/54278008774.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/binonutod.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/xofatunukurolijadezuj.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/79233056204.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/salitaden.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f64d0f8a99e76a95dffa7cd08880bb/70448693234.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pc5mk80fqatm75ldlotc6k50o5/bumilakiwofosevafosafilo.pdfIn PDF document text
    • http://wych123.com/upload/files/mosopinenivolufi.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/nikikesoxarodaxug.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a460e624e74---67159033191.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/46288921197.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lexipibofuv.pdfIn PDF document text
    • http://aimic.com/userfiles/file/91153653109.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/34814808191.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/zinojovirisa.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1628945450.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/73333615674.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/18747469558.pdfIn PDF document text
    • https://angem.fr/userfiles/file/xudomabufujetamajile.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gixaxarewavevel.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/90404756596.pdfIn PDF document text
    • http://merwepizza.com/upload/file/98631684591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+magnetismo+personalPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 10840 bytes
SHA-256: 2b2cfb881c9994e8626716d078441c76af8542d011c39a6f7f7ea96af6c48e78
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 17196 bytes
SHA-256: d998d1452d1ff120717810858a5eefe630ed998e7f27061c8bf33a9c2a483ea3