Malicious PDF — malware analysis report

Static analysis result for SHA-256 44df1d0b6084c115…

MALICIOUS

PDF

81.2 KB Created: 2021-07-20 12:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4d5b2aead0f5fb1a7cbff1cd8977498 SHA-1: 5ef343fbc1d54e1d1917299b5c797e9965d7184a SHA-256: 44df1d0b6084c1159710a440548d72be66731fca68e73982baf2bc53cac5671b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/30310784152.pdf In PDF document text
    • http://arch-teh.com/pic/userfile/sajopetedude.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/pekuwejurer.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3h37qgfn3ojnolps6eedfo1o71/furimebuvusijabideb.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837b1c69d46---peduwaxezadujisejidu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ba2fe0978b454423e3a0c91b5f9e4160/vetepagovokobese.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9805c6a863650047db0c5aaaa637732c/99905112227.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/veweni.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dbf3f9e316f587cdf35342510c6216ec/ravepevufanudure.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p6o9hnd9t8km7hsg99mqn5qa92/80740464164.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/siwuregofok.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/91779136123.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/tikowinorofisivinesuro.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210625055218.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/86iguvctbiodlsulhghqn0nrj7/fubimaparojibo.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/takisidedoxisiwijezagole.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/5990629674.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tokewobimizituzokibujuv.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fd8bf832e296f6d7493c51dad81cb10b/51083772333.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bd8d8e4768c02ee291f2a5cf877ab8ac/sexivukodudarukebawip.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/teleg.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/31324199336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+provide+a+link+to+a+pdfPDF 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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16464 bytes
SHA-256: 8fed4f716f0bb635e38c671cf190540ae392176aa6cb86e832324ba4412e1e86
font_02_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 10556 bytes
SHA-256: 5a0dd949290b20cb1beb149ceaad809206a6b6a7da0f08facc18360b7dc8836f

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