Malicious PDF — malware analysis report

Static analysis result for SHA-256 901f27098ead9ac7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-20 01:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edce8dd94af269b0e230ffc836607c5c SHA-1: 06ac34af2535ba53a128822e0b471e885859a1cb SHA-256: 901f27098ead9ac786a417f8f26bef739e70a7a73ed6fc0aa4054d9b76d995fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with several pointing to compromised CMS uploads. An embedded JavaScript stream was detected, suggesting malicious scripting capabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=websites+to+watch+old+tv+shows PDF link annotation
    • http://full814.com/upload/files/41685772423.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/weved.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/47317952980.pdfIn PDF document text
    • http://proxima-design.cz/files/file/rupufadejenadaranovi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/71524401030.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/86320453262.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/vesutudexejipa.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/biwuz.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/jokuvexugopuwasetejoto.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dibav.pdfIn PDF document text
    • https://greenways.at/userfiles/file/75326754090.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa60a7ac9a---85269927133.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/fudikuzabowewogidiji.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/79528791535.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614570181116c---61826339888.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_F547C8726463AA17.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/nuwomuwexazogilisi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614447d46bde6---91926302566.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/xodaxuniwa.pdfIn PDF document text
    • http://goldmustang.com/files/files/gujisekijosare.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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 16316 bytes
SHA-256: ca566b58ddda513b0f591cb74a09b2303f8e20518a9059d2cc45229c9351debc
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10548 bytes
SHA-256: ebaf3006c6190746e88103f5c39f3524c1b014d47056246cc4b83e56855035e6