Malicious PDF — malware analysis report

Static analysis result for SHA-256 3563d30eb15339c1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 23:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 888d50c70428c2c870331fce75763e5b SHA-1: 4517edd903ab5c46ca6d19304d45d84166f32f7a SHA-256: 3563d30eb15339c1a8d31542c8de5411d24e20b928d74228d214df19091b71fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the file contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards an attempt to trick users into downloading malicious content, likely disguised as software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.champagne-auge-dascier.com/ckfinder/userfiles/files/99057146561.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/31508759137.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/rafujijalikigosu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/netofogufawiguwo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6e374f914311566ba04ed91a1afa2a85/77843989928.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/88845047937.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vinijugapov.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pr551a27uqk56n736etdvig6tj/zataviwuvewadumanuzi.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/piwederafujipabisejina.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/siselumonobubefasol.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/m96j5r6dcfqaip5113nq08nork/gotorosaxosupabubuwa.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/aqqkjnqjf5h0tbjoitmc2ark65/86599168891.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160862dd9c2869---boxalikuf.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/11202101094.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/navupefumovok.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ah3n7cgpurqb38ae6ngpgl37e2/55188952016.pdfIn PDF document text
    • http://15881588.com/ckupload/files/mujet.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733676baa9e---kexuxegasibexafilupezow.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/tejituzuda.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/99635315731.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4crkb5ee5hu2c0lcngc7qp9tu4/82951912471.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078030538ff7---98476260740.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f328178129---64195958289.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d459efccddd---41584351471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=office+2019+vl+iso+downloadPDF 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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 16976 bytes
SHA-256: 21964c84c49a08d6f93a807f2ba25634ebe45d8246423b7338ef621c46613c8d
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 10908 bytes
SHA-256: 56cb2a470ea9eab56d2f7e7e65d3a952af0873bb57e6c1fe04cf8d6423427be8