Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fb2b7f744d6895…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7fc1a2267c65109c4c4ec2fc635f0f8c SHA-1: df5fa91f483e660b73a571b5f4c4c6301425980d SHA-256: 05fb2b7f744d6895669875a218ab146a122ea56b9ffd45e83e5013995e9ed3d5
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://arcadia-fitness.es/userfiles/file/ruvunogojefesavaf.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c662d1b29---sixibidox.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/suzafubisowarimugapegupod.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sakulavajavetupexidafig.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/fagerupejowibenexupozu.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210918_5254AE7824B13BAF.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/63058537526.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cce118f4d5e0d2eed7d3377a3483ebdc/4868326032.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/32744675543.pdfIn PDF document text
    • http://idcla.net/upload/files/96852442616.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/27987701328.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/99547014331.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377d1642572---fizuxi.pdfPDF link annotation
    • http://georgewongdesign.com/gwd/upload/files/kazodiluxukuxejepux.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/ropetalej.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/denemonirugepirorilidu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/88900546370.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/niburo.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918214837283.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/97647315920.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0e4cd5445db27a5cea9c63a4efd64e35/deguvik.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/monudazux.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/nunaxaxerakatovagobo.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/18419629480.pdfIn PDF document text
    • https://jobtiara.com/files/files/damepesigumulogovavawinu.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/39965481530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+joy+of+creation+reborn+xbox+onePDF 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_off0000c108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 10668 bytes
SHA-256: b99a1b504c5f72f601c1a03181b4c5f53f67dced14e4056f7f738b5d65397df1
font_02_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 17196 bytes
SHA-256: f3ed2bf08c4469125bbd3068870e2b03515688b3c73dd1ac4409f13d494988df

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