Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa5d6722fbfcfd5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 09:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2088863189fbceb1dbd7f9fde8cd2f72 SHA-1: 974fecbf0a4865c4d3fefacf5d7bc9ff50f3ae84 SHA-256: afa5d6722fbfcfd515720eed1bd5331d2e5731ed639fdad2a2f330b51ea16534
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8796692c8---penim.pdf In PDF document text
    • https://strings97.hu/userfiles/file/buzaf.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/53195226560.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/30759708857.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/3708896436.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/85450622672.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413b4491636---53330449891.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a7bnmlfanlvbgscs2qq7i26ma7/kigutaganojozi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373085a4a96---8381439151.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/bojixekugexadunipu.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zitororuzipibojekazideso.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_47F898C0E76685A3.pdfIn PDF document text
    • http://wawa757.com/uploads/files/76389810019.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/nitateg.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/68794293543.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210917_6340C2E1C45254FA.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901211357326119.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/34069279154.pdfIn PDF document text
    • https://domilot.com/uploader/files/fodijefilogenijasoretiwoz.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/8205380516.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/46876368227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+outlook+exchange+server+settingsPDF 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_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 10992 bytes
SHA-256: 383e5420dfc6c575a4360eecea0d15e6876b4a8498c47142f0c5e6cb5d8b13a9
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 20092 bytes
SHA-256: a8f4fcf4f55d01661b69087e97d2bc74d9032d1e7e3a2caa7ddb74bdc80b9569
font_02_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1