Malicious PDF — malware analysis report

Static analysis result for SHA-256 b038f33cfafa55f6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 03:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: caec3d17792a4db687ec02226dcffb2f SHA-1: 0f521e246a1bdbd6f1e01f67196b59c0d085e967 SHA-256: b038f33cfafa55f69ec22f5987649c7726cdff2f1cbcf40e9cba2751f67d721e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on potentially compromised CMS uploads. The presence of embedded URLs and the 'QR-code redirect lure' heuristic suggest an attempt to direct users to malicious content or phishing sites. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://benqmusicworkshop.com/fupload/file/93469157083.pdf In PDF document text
    • http://superlitefan.com/uploads/files/rifajupor.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1aba9016b---36372046561.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/figadifoteridilipotoni.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/jibutenadimibi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fee7a3bfc---lozalit.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/dobotisigaxasizupuw.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/tugulewomibakimaruw.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/mofojonelew.pdfIn PDF document text
    • https://mollis.rs/files/kumavomafogikezoxefe.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/75384653049.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/69151290459.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/xafepimedejumavolujafu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/pemekavaruronav.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/84538722874.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/86106760728.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/sofevekomemidakonubitebi.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/44208875141.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614332461b1b6---jagabejulegef.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/61e3396605c272bd320dbe927e7720d0/vafipupugunanurisobugafam.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1215743049.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/semujixadajegaxotaj.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/44135584370.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/931e61500fc25dbb55f3e94c668a20f2/jobujodufetinapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=qr+scanner+android+reviewsPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 18652 bytes
SHA-256: e4892a195eebd5aaf88b2563c91a3a1132a34e5622b96a47ed287099279e4116
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10432 bytes
SHA-256: d19bef43f6cc66a3222624d9813f5dd80c9bbdef3a7a1d8f8f8a8a8b4ca42cc2

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