Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f8fb172ab568f7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 23:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5aa615a343aef9f79c96b2cf1d49f65 SHA-1: 36bc54e5743d00c3c002de612b1c53e890fcae7e SHA-256: c4f8fb172ab568f770dbee35dce663a3c4b31a08f960bf5dae01dfc47001c539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://too.kg/wp-content/plugins/super-forms/uploads/php/files/83ed96d492ea3c22958520747352ba20/34863080376.pdf In PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/31101207829.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/mebukadibuwagawimudo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130855a9895c---mudigupujibu.pdfIn PDF document text
    • http://santeh.md/img/files/razutu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/papusosexedutiperida.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/55598021578.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofigawoxukifaz.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/88037466690.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c28005445de3baebb2d03c716e176fd7/jufiruvog.pdfIn PDF document text
    • http://candientuvibra.com/images/file/fesirel.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/48687368518.pdfIn PDF document text
    • http://tayles.com/uploaded/56753962389.pdfIn PDF document text
    • http://snsi.jp/image/news_file/bapelizegij.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/23492021947.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nowaxetan.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/kodobivamozobinejikidok.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/tenifaxipitololil.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613866d1a48b2---kajepelafutulojowomozu.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/begozuduziragim.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/tipijuboma.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/dawobarirev.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ca37f8b642d27a1c718d9d8c34676a9d/32764785499.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b962f04d---jojisepuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mirror+android+device+to+macPDF 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 10376 bytes
SHA-256: 044940b217bdc2bde1a12a4f9abd54251e1d6d30eafc6d92129643e59511ad77
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 18028 bytes
SHA-256: 9ccd525577e1afecc7a075fb311792aa46cbf4853e52ff59eacf0ec7d569eb3a

Open this report in the interactive analyzer, or submit your own file for analysis.