Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac5084f5d638ee3…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 01:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 906c9263e9c7338ed0539bc683189c11 SHA-1: 85f27ebce2c1e2d7a4e2bde29747338495a5360e SHA-256: 3ac5084f5d638ee330db9aea2c050078b44ae3023aba336155ced0f2864d4b03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zit-tech.com/userfiles/files/83364464779.pdf In PDF document text
    • http://tamlaproject.com/userData/board/file/26161812142.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/sivok.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/buleviku.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210821_50F5E0F5C8C18412.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/zadizemetobuxazema.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/004358b176f0dd902c326dc7c61ca5bf/60642960587.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/1274468735.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/72542811517.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00a3864ba---98231307439.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a45efdb0598---soletatosaguxajipive.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/40893770513.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/45735558708.pdfIn PDF document text
    • http://balone.net/_upload/file///85045130293.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rifabezazaxapetizimowed.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1a3eb07aa4f3c673623868a58bc9dbec/pavajiwepato.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/mifukemakosadig.pdfIn PDF document text
    • https://olterus.net/contents//files/7691308720.pdfIn PDF document text
    • http://www.moyekolodin.com/files/49689255070.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0bd2c696---sisomepotoxoteduwaxa.pdfIn PDF document text
    • http://mayjack.com/upload/files/10827729220.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611056549c9e5---45809254407.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/49807810178.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5b82279b2---garitekofedosogiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=export+pdf+comments+to+excelPDF 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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 10612 bytes
SHA-256: 08fd834a34b3a8403e130f246235149314712bf9fd64801b1e162755af93c553
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 17156 bytes
SHA-256: 20502dc9c5ba3555a851584f899166cce08b00d58b695cacbde000dcd51dd30c