Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe0b12fe088cbee…

MALICIOUS

PDF

90.6 KB Created: 2021-09-09 08:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2db394f617362a8af2c78fa3b029a6f SHA-1: 24e91196935fdfa0327645cf8b95148d7f5bb31f SHA-256: 9fe0b12fe088cbee55ba0fe7c604037535482cbbc9312e40c562260ff2a219b9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a link farm pointing to other PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm likely serve to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ef859e9dcdbe1813f8303d6cdf230f79/poximebirakudojisowa.pdf In PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/81931631711.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/95220584076.pdfIn PDF document text
    • http://sksound.com/userfiles/file/78241189193.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907214657838875.pdfIn PDF document text
    • http://m2m2design.com/userfiles/24505840618.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/dagokexafagutul.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/10536078148.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/88610155910.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3248faee---verewowisajekexebeku.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gepowurolikevusofu.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/kiwurekopubajamezu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/tadawasiti.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/77377605647.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/rokawupelepe.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/zumezajemimovorudak.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2752429958.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/86822512807.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/nenage.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/liziwopelaw.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/49253113796.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/nhbk24uebq2oce3qhiig7uj9mf/lipujeveji.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/27006414908.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/sevabalena.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/mavamuno.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/64346893470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rbi+baseball+14+androidPDF 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_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 20028 bytes
SHA-256: 5450209304895285abf459fb26a6a309a3836beb6cd137cb0bf8557aca8c883a
font_02_sfnt_off0001445f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445F 10456 bytes
SHA-256: 67109b270c2622485eb53bb1c34827a34ff4fed17b08436ebbe48e739f19bfaa

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