Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c73da1c974ba61…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 09:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3daa373388354b6e6688ab4b3bde4632 SHA-1: 143aa0cea3f0089bf9a756b6a75f79d71c082b6b SHA-256: 80c73da1c974ba61632a1d8255eaa354cc1a16ae08478a2e2ba738e0b951e8d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://inwama4.vn/webroot/img/files/lonufe.pdf
    • http://bisenzia.it/userfiles/files/5527206082.pdf
    • http://ydis.kr/userfiles/file/191101333322.pdf
    • http://kiddeefire.com/media/userfiles/files/dezorotodaxe.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/xusezoso.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/fe974caad17c7059321d852bf8a9068f/mufejuxozabibel.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/koporimosativupojemewet.pdf
    • http://hoteldanang.vn/uploads/images/files/jasositedadanoduba.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/xipukizofugawisovitulut.pdf
    • https://tlproduct.com/userfiles/file/65832404875.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/sikezixasib.pdf
    • https://chataigne-cevennes.fr/imgs/files/69640713182.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5dde7899---88095785779.pdf
    • https://vyrukrc.lt/userfiles/file/pufijodibanimanu.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6b09014e---lawogiwaratirajaviledodej.pdf
    • http://kpotplace.com/uploads/files/72058979913.pdf
    • https://mimpishiosatu.com/contents/files/gilojerafuvofabi.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/89292688831.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/52655931461.pdf
    • http://abwcoliseum.com/uploads/files/rodasokawupodizopiwo.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03d73d5a5---39052200885.pdf
    • http://valdhans.cz/userfiles/file/konejakaxumed.pdf
    • https://gyn-koe70.de/obrazky/file/406504285.pdf
    • http://globalfeedindustry.com/upload/files/19219549536.pdf
    • http://ristoranteibucanieri.it/userfiles/files/dizetokixatuvagokamamenoj.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334e36aed59---nofizajedinik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mac+outlook+indexing+not+working
    • 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_off0000db92.bin
7bd7b81c4288d6bed65b79f4159b8e371c1f9dee22d4363494e705a56fde0d07
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 18212 bytes
font_01_sfnt_off00010b54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 16792 bytes
font_02_sfnt_off0001236b.bin
c1c31a507941e2427c4e597d6d1c99cb7e750ef06e02f2ed35c0a0b8b58b948f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 10752 bytes