Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7af267f9cfbd5d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 05:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea8c592c842b7f189d24955769e0f283 SHA-1: ccfc772cc1185a0d2c8d7308360550a6d088f7c2 SHA-256: fc7af267f9cfbd5d1b266926a056e2afc1ffb2960e21e09d652fc73b0c28bf6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=aplikasi+tv+offline+tanpa+tv+tuner+dan+internet PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8q15jppf1pig7hg2f3th980l04/zidebudiwigobev.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/kopujovivugidapofuxemez.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f334f7b201---supimob.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/lamimiluwaro.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/71509454692.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/moxixajuwisidazutej.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/22223359286.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/14344408454.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lagogesukorirozopamijo.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/7009199287.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/bisemidonorawanon.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/fuwazufi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/74119634263.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/loxonexenozutano.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/welebu.pdfIn PDF document text
    • https://spyboarcams.com/files/raxugadisinefumabub.pdfIn PDF document text
    • http://tochuchoinghi.org/files/39423935593.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/13338325636.pdfIn PDF document text
    • https://zzwgjx.com/d/files/guvasabuvuwitedarade.pdfIn PDF document text
    • http://winso.tw/userfiles/file/56926509336.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/likanijevefo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/557762b2150a94d21e6085b0c7fbc8a5/15092968497.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/15845770290.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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 10732 bytes
SHA-256: 91e731a23e1ba1cb137e76252956e26e67e72fd8c6acd78d46974fbb1d61891e
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 17608 bytes
SHA-256: e15c18177448f7bab707ab90c600e3fc87622dd7c74270099c6cda88ee305f3c

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