Malicious PDF — malware analysis report

Static analysis result for SHA-256 363fb65d59ee6c53…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 14:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2629c2aef6644dfe1655fab08a6724b0 SHA-1: 91f09e79659745594c78b96a4ff5251c65973bf3 SHA-256: 363fb65d59ee6c53589db51bd00c7ac0718598f949a67226f32ca30e7961b2a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7faae5f9---tinofulesofuguji.pdf In PDF document text
    • http://formel1vermietung.de/userfiles/file/sazanosejolonoxakera.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/vewitomujiro.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160be0fa52f7b7---50244482902.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/devubevodetoxuviwe.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9644ffe881602ab0fe79ec9a38edd7c2/kusamuvikulawamatufa.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/nezerufosufunosozunufu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/50034169867.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608666435be5e---76485251602.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/50689969003.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6igbcm39t50j3eaq1apijmb0cb/1381491704.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba5f6ed7e---jotojogusanowuteva.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/watasilujifefu.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/62233880674.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/08ca95bd37fd57c114c2994b02668d53/devazoruzusubixepadugox.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083adbc0daaa---madulerow.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/soxokazovirotudodo.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/lilulo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/13906864720.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2b439495a7aee8a299796ac8180d5210/vapibigidakomesazibudu.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/10166070117.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/benujajapukokupajiwokedez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=simple+and+compound+sentences+worksheet+with+answersPDF 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_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 18100 bytes
SHA-256: ce6f6cbe59e6db8469d0113430fcb225f0b15849bb0785e82f4e14a62e6bc700
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 11132 bytes
SHA-256: 296934443a05fb18055617786bc743df023273e9147173c6018cd7b0b3ebf68d

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