Malicious PDF — malware analysis report

Static analysis result for SHA-256 1248e2f8dd56e15a…

MALICIOUS

PDF

102.4 KB Created: 2021-07-31 05:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 377d06e221494a2702b63ea7aafe6b0a SHA-1: 3a822f0e880d1e7f1c2d1acdfd4a2b5f1a531467 SHA-256: 1248e2f8dd56e15aa7bf3eb02e57b9f343873cc3bec4c82eca9d2ecaa5ad9500
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a link farm with numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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 https://crewmak.ru/uplcv?utm_term=peliculas+de+barbie+aventura+de+sirenas+1+completa+en+espa%C3%B1ol PDF link annotation
    • http://stphilomenaonline.org/userfiles/file/lupewemikowababakobifitem.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b9898861---gibokawelalegozusasoni.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/nifix.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wiwexorokubo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/81cc0359eb32a1fd0978f0cf0d6bb1cd/59232560190.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6eb46c9c---79720651863.pdfIn PDF document text
    • https://petala.gr/userfiles/file/56614658730.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xogebaju.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/67731857132.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0e0ca466963bc5824d187cbadc67b02e/vapumazix.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d303a2bee1c---kufadinepotarujad.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7b9dfe7a703f14e05c2384a7aef9c36f/31469833835.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911dd6c51e3---66415860059.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/zalirofewopova.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/saxip.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/55110631593.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/gifatope.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/2727748812.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/40483387361.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/33038803221.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/84667006839.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea1251ff---sasopudalop.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e631ac3ed---6673936076.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/48266060112.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_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 19036 bytes
SHA-256: d1d6cf8db68b94745b84e1746412fb887692319ab8cfe7134495d2074df52312
font_01_sfnt_off00015597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAE 11240 bytes
SHA-256: 9e4098bce4ac376ece5aabff262069b7426106b20865dbfb443ebd84785934cd

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