Malicious PDF — malware analysis report

Static analysis result for SHA-256 82076d9413b51d32…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a906d9ac6d67b83ee53ab8369d57209 SHA-1: b16efb49f5784db135765970238212b8a5378929 SHA-256: 82076d9413b51d32c1a4e52c059a34a4287e9be4495919614d67dcfab2829361
156 Risk Score

Malware Insights

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

The PDF 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 multiple potentially compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://sicilalluminio.it/userfiles/files/lakukulanuwetowimijusiro.pdf In PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/98929669354.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/65155634931.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/bizuxeganedamaw.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rt0hrltn3stmfh2q5ms28ktli7/61657249217.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc491172e---56525773315.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/80026635781.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/zumopezuluzali.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/megopewe.pdfIn PDF document text
    • http://hainfelderteich.at/kasevijikibuduxorer.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/34290444324.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/17818809089.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/finamazogimodetinub.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/46975166196.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/dededuzasidigadi.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/74811078881.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/83945019917.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139998aa405d---26448172587.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/19935599354.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/19225277294.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb72a993---nipuwewiresuxo.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/72540645423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+clear+search+history+on+chrome+mobilePDF 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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 10828 bytes
SHA-256: 46cf08a6e9ae0061dd43e2fabd8b5979c610940ae5746c1bb64c2f1bf1eaef2f
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 17576 bytes
SHA-256: 2f3d1b62d5397cfa67dc617e253d7d2a7dfbd11a27c5371ba5ce31a879dffee0
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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