Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bbe478c15cfea5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 11:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb2e2cc05736c6dee57090863a05fa75 SHA-1: 5ce14ec76ea56ae43bf460137baaf3558b43e213 SHA-256: c4bbe478c15cfea5b6e8681ef7dd92702749d64b944363a9e443f7e6ae31e7fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=how+to+download+news+article+as+pdf', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+download+news+article+as+pdf PDF link annotation
    • http://hansungidschool.com/userfiles/file/zimolobegiju.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/28463814902.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/26522655837.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/talowavajokokozeninux.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/56616477243.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/rinupokamadivemotebutosag.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315711408e8---40432257682.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/1197333584.pdfIn PDF document text
    • http://asid.rw/userfiles/file/lifiruj.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/40184769882.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613131920805f---69976692371.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/67699323351.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/kapazad.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/gamipinefutun.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81214030814.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1c437edd03aa6b9f3716525ff2491749/dovubepa.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/82375941390.pdfIn PDF document text
    • http://petrduchek.com/files/duguleguwemesofomiro.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/wirowegunalolonopud.pdfIn PDF document text
    • http://sns.hu/_user/file/34104535336.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/jatisinosamam.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/34623941938.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf371f8c5---fixuwalosid.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901173104.pdfIn PDF document text
    • http://digifast.cz/userfiles/menoguli.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/91810019916.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 17832 bytes
SHA-256: ed33b740e64de878e1aaf53f54201bb46c8d404f91de0eec19a5cfa2b8b5daa5
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10688 bytes
SHA-256: 7c3060d43eddb7595847636a8e6961b383341058f306d246b4e52a662ebbeb7e
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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