Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28b0cb15ac4936d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 01:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4afb6d0b893d1fdfbabf2a33db405f4c SHA-1: bea35a0e889bf7cbf2cc05285625c13b33204a72 SHA-256: b28b0cb15ac4936d201a330ead7690c7809da7b223f45cde1194c74ef1cff8ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=build+android+apk+react+native', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=build+android+apk+react+native PDF link annotation
    • http://zulassungsservice4you.de/bilder/file/74439310656.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/regudoko.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/85657664994.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/xesedeperiretavuturovo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7mqp6pnhkjhhlp93m6h518ao6a/sajunagadaxuxatubomegizef.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caf61c5bda3012ee961b693b2eb559a9/8533429001.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/jomite.pdfIn PDF document text
    • http://net-marketing.hu/images/files/wubulesezokajovexinif.pdfIn PDF document text
    • http://annabarons.lv/files/files/jakawiloxadepuwewikigevik.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jelorefuta.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nirikusijururuj.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/nevokofan.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/17912415227.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/f5a53ed26eee505249f6949b05e60a46.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/92967037072.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/91613399118.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b5e607988---wetiped.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/jujixidawoduruvolabateku.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/90430302531.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/22623124604.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/repopeserotivitipibapadap.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/fexoniguva.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/52018640342.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210906233838.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mawofekanodali.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xetilefebovifexafuviwomit.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_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 10648 bytes
SHA-256: c5490670b2aed7c505e018ab67dfda5f3d15599bdc91aaa715f42a09df5ed10f
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 17468 bytes
SHA-256: b760b609db94a7bb9970c6d697dde56b50d8b9f20b682728e4dc15a173e92507
font_02_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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