Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed440b678e26f2c…

MALICIOUS

PDF

83.1 KB Created: 2021-10-01 21:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c5cef1afa6a0e289d1f96f6e4da36935 SHA-1: ac2f9a4dfe94384e9084ce2b4166c1c6ddcbdc60 SHA-256: 0ed440b678e26f2c35d05f4c69bcb1a7756e841c7c26514f29aa29b7f4985a5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://medvor.ru/uplcv?utm_term=bangla+choti+2 PDF link annotation
    • http://maidichike.com/upload/files/64407511416.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/34506061949.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/mupakonasemunedowizajifur.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/19437885572.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210903115053.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/wurajow.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ntmv2g482kufifaq13u1a4bl5c/92471502452.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/39331487465.pdfIn PDF document text
    • http://naso10.com/userData/board/file/31388296515.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/rubomunuzebog.pdfIn PDF document text
    • http://goldmustang.ru/files/files/57584115775.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/86993359185.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/getifaroji.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/30872134028.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614724e788ffb---muratarobasijeki.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/jeruk.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161558f9f732a9---faginavozupewamubofuj.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/96131970747.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905190436328703bgjzjc.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/67361991132.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pixexulududurem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB52 17292 bytes
SHA-256: 0af05bd8491348a9a4ed6b3de798379f3b81776fdfbee6a7647febcb8271d8d1
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 22028 bytes
SHA-256: ab7c0b9c8e54540cb2a2d208108fa5b3806643ec3560d28b621b4e56161b03f4
font_03_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10280 bytes
SHA-256: 1eccd305c5a36aa13afc1741794eb8d37cfe609826db39b7516a72ee51151fed

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