Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d4b0022a634d02…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 18:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f33e4840f27413b5c8a9c1255ed35f51 SHA-1: 2f23e98cc8d4f1fbe4662754752b4a49f80b095e SHA-256: 62d4b0022a634d021864a159a67621371f515304a4bac9e275565f2461bdf726
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic to distribute links disguised as legitimate files. The embedded JavaScript likely facilitates the redirection or download process, aiming to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=auto+tune+free+download+for+android PDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c373b9cdf---todoxuf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/41d6bd2548a96daf2a0d3729341845d1/zigerupinakafofujujadav.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be66538492---5051753609.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370c8f603f4---fegonaxirafuvevali.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/78998398963.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/19630286932.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/navenusetid.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/vanarupeliviziwusuvipi.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/sekewobebudovit.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/10957035922.pdfIn PDF document text
    • http://kccmaul.com/files/files/90033567919.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/10522345932.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/dawuwadod.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6277ab6451d720f9a669f91764d41baf/47869007059.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/83118425366.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/lamosojolevifupaj.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/104273920.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/barozagakaxilunegow.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421d9841664---xukukejiwadinitibejire.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/86199688611.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/99962887800.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/nakujugiwusim.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vuxovikoxomaror.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/numenef.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/tijatubivise.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_off0000bae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10344 bytes
SHA-256: 1210dd450dd83333d0c173e703a80e8489153b8f5ebc6662209d997ce8f3dad1
font_02_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 15588 bytes
SHA-256: 8fe07f5641d0726d53619a1973923e8487f75d705f0a291681aa6a9782714881

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