Malicious PDF — malware analysis report

Static analysis result for SHA-256 7655c48738c4465f…

MALICIOUS

PDF

108.7 KB Created: 2021-08-10 05:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f16c2919739dbff6fdad4964040ca426 SHA-1: 0b4ccb6d38694eb81803957b7e35db79dea059a8 SHA-256: 7655c48738c4465fc752af0deadca7626948d77d8c9de757728e0aeb7f2b9212
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://mariondhuique-mayer.com/data/file/zojumagagowixon.pdf In PDF document text
    • http://noithatsah.com/webroot/img/files/89476660302.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160780ee987d95---midevinumuxoxinis.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716e7a2cdb3---50099816515.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625629436.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/vazaj.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/soxenamegivu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6f459ee39b243c1931e5180b093aebbe/67945282528.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/42269408407.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/52691605020.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/wijiku.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fef3e61e14d64f6c357115de5404d1dd/20425953190.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/xopevefas.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guridebulejazix.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfe501320---pojomodowaw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0942f4fb---negebonewadidogenojefib.pdfIn PDF document text
    • https://airshow-bg.com/file/87342535964.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/90322286946.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2f0e6f545d0c8d3d66921d672d85bc5a/xemenaxogewurodevozo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/979a0dbf1bfdc8ab8c529916541817e5/retitesone.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/kipulamibaged.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/napubexesamituvakipafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=siskin+dash+cam+hd+manualPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/69045266308.pdfIn PDF document text
    • 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_off00014568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7A 18768 bytes
SHA-256: 6b7dbc75fbfd964be11d55288d3460fdcf2ddec425a795b66bb7e5e4b6b02383
font_02_sfnt_off00018d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D14 10452 bytes
SHA-256: b1c9eadb2f3a29574314276c2a6de691e3b94943ef370357a18d5519d83fcb96

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