Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8783669cf5cd2e…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 04:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4f0cc764a62b2b49b53905ec4ef1571b SHA-1: ea40c48d7069df9f8db4463f7f5687fc054e5727 SHA-256: bb8783669cf5cd2ef01ff59238d7756e95e4004bdea46e40701261853374226a
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 numerous external links, including one pointing to a compromised WordPress site, suggesting it's part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chafewyuok.handysociality.com/upload/files/11709538688.pdf In PDF document text
    • http://hejia-ele.net/upload/vakipesufag.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wotevebujid.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/74367427571.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/60893055604.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/71802435996.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/54643122081.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/wubojeze.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/18168198459.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/54586195644.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3410eee7462edda3b5821576d460d0b/35924981882.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/1554867242.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dapidolirodemuvutavumimi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jawubodevubomonedudera.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/14603518850.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/dafonovonapozozurefuzuj.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/85833525184.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/257553270.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a875d343---23642874374.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/karegijakumezipubegut.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rigon.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/93412108907.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/duzukigo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e5dbca58ef75ade5709b4d42c219ed31/mobotis.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210908041649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=printen+android+tabletPDF 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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10212 bytes
SHA-256: 001d96742cd9eb1ca709d60f107238f72043c63a4680078b183f4e2b7cba3162
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 18716 bytes
SHA-256: 41a3e3e5c7da2adf5d5d131093d46c4b3e78726af470d8f5d6f32c2b20f2a015

Open this report in the interactive analyzer, or submit your own file for analysis.