Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c478283ee0ced…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 11:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8251ffb19bf913d1d158a239dde9152d SHA-1: aec288ef5b8e1ca6cbf9dfb0d73cd0f58b06e4ac SHA-256: 156c478283ee0ced235b94d659c032d6e44a950fe22c15281d01e77eae19eedc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS uploads, further suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to the overall malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://damiel.eu/userfiles/file/regedakafanavozizureruz.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138de2292700---vebubemimadawufisu.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/6029881157.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109020327586955.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jesegidido.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/wozodadifizodinutuvigu.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sarisefufotezosusijoto.pdfIn PDF document text
    • http://partnercable.hu/files/govetabifogiw.pdfIn PDF document text
    • http://uchid.com/uploads/file/fasomexifurifego.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/lotubamuvafup.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13e6b2946---6971581075.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/fakajo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/57797734474.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8a11bea768c5c5ff88e20fcef298fe5f/41749717968.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wuvovaxadejagovamilenotem.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/farunuwofida.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/80co27dqtcfuicohm3nksd9v71/66860807511.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/841bda8c95dba9272d0f36010bd57dc6/49472650753.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c032b7522e---xamefamutapodowewe.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/69928382482.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xoxinosudef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kodi+android+cast+to+tvPDF 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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 16308 bytes
SHA-256: 25f1faffa8531e11103fc8e2060fe869c7acceeb33b3c89bdba2eb5e64115466
font_02_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 10240 bytes
SHA-256: bdefde5cf88643a209ad7418236541a10e714a450fde9711de2978aebbb8f43d

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