Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e3579d18ad9859…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 13:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 026959f27c8230946befaca0855c6c1b SHA-1: 521b4e4f19da915e25a924002b662dff2eb0b3fc SHA-256: 25e3579d18ad98598e1dc29b6dba78600d72b7742bcb05998a23abd436fb4bbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://denimder.org/resimler/files/31255986043.pdf In PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/tusadinukosede.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/21852682833.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/456d2bd17cb133b166eccb54594a2d50.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/jitutatopiruzuzaboxokefo.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/jarobuw.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/kebelobetotidaboliremog.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/85746509370.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/11714417291.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-24/20210924131235863175.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f119b37676---74765371740.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba0d8341d---zulaf.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jikufakefinez.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/7259407640.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210919034831.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109072152418846.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/59915871949.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pokumavupudodexetu.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78481450634.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210916210952.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/16506139989.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9d89750e9---70486822447.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/zarabitajaxukolavibuvis.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/57589567989.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/72831009280.pdfIn PDF document text
    • http://micruts.org/userfiles/file/83503125752.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/54731976250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=unlock+tmobile+phone+freePDF 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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 17224 bytes
SHA-256: ffaa85fbf13815a557dad7c8eaaf9b07bf14a8644ce0a6ec6ecb39011c51477b
font_01_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10652 bytes
SHA-256: bdc6bca6beb0fab0df80ee69f21d56015e89169b02b8eece78b9845b71011b8f

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