Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0934469b1dc778…

MALICIOUS

PDF

75.8 KB Created: 2021-09-22 11:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a3800ad15808493ae3619d89f66f2b02 SHA-1: 52899b9fbaf1713ad10186d38a1bedd884867a6e SHA-256: eb0934469b1dc778fe392fb174f053b2ba2a7eff7d66e10c0d00e67d99baec4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS uploads. The presence of external URIs and link farm indicators suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=ghd+sports+apk+mirror PDF link annotation
    • http://bhk-aindling.com/userfiles/files/7752944000.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6b975401---75941671801.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04ad6ac03---12502847535.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/wafepalosutamamapazimet.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/65566584155.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/10368035682.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/tuvilavevizav.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/43141980815.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b29e09b4838f11a00af34e76bfcab65a/21162189456.pdfIn PDF document text
    • http://adice-area.com/pictures/files/36630954065.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/fanurelifimef.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/80881217225.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e7279a6a---pepavolupunamenesorumasap.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/32779090972.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kufemubevananejux.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/10190807228.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/tofizowuwek.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/raduwatuvokamalo.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/woxevibizegojobobiz.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/56274350722.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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10508 bytes
SHA-256: 2bd5defb9f46e4d7c94a3c70c292218d196bd3db5876df04cb6e764be1b9ad93
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 17164 bytes
SHA-256: aef5bbb282cab9ada6162541597f082bc7e77e5e4eb997020ae0991542c6ce94