Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9805ec4f058076…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 22:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c772075de53cf3e194c58072da2775d SHA-1: ee2f72aec7620d1c56319e0bd2c4876e0f398d89 SHA-256: 4b9805ec4f058076ec5411f5aefb8b696f68465253171ad2145ff86a72af4bf5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=magic+tcg+android PDF link annotation
    • https://ntiverification.com/userfiles/file/54946679519.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77948841445.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350309c2ed5---92619391697.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xetizisegenogupitozeveve.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/xiram.pdfIn PDF document text
    • http://www.bash.cl/media/file/sijufexeganagaxitaji.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/bafam.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/detajusavaxepeli.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b4e6ca3f---saximoxogijifisi.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///85909774147.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/39519260178.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/rabogozo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906172248.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210912103702.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/verilo.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xokanuwuw.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109120053012489.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-01-17-32-62.pdfIn PDF document text
    • http://spiregene.com/image/files/20210909_125653.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7fbb7c937---4207916114.pdfIn PDF document text
    • https://ratodua.com/contents/files/fokidezavowezepubebigad.pdfIn PDF document text
    • 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_off0000c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 10192 bytes
SHA-256: 0979cfc734e5ccce11a0b7e8d26d2bfde1d8e7da8c6444c88d91c23739100a60
font_02_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16952 bytes
SHA-256: e618b0e048a997610a5a0edb886164b0577d310c943c15d57e9c66bf3d62fc1b