Malicious PDF — malware analysis report

Static analysis result for SHA-256 76326c6d93b459dd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 09:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63d6c1ffbf01639c5e72ef1478e02495 SHA-1: 4ff6c3574a47f8d8fd642f3c093ef82c55a97df2 SHA-256: 76326c6d93b459dd7cdd7f12a5139164fe721eaec56ff248b475f2fbe5258843
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the malicious nature of the embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa67993e5f---68886816387.pdf In PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zirusuretemikowedizekiga.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/xowasudeguxakag.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/50116322078.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/nufivoza.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910174940.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/98544456951.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/48905414586.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/barewekekigiriloma.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/xinujugezowamofumuxufef.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17965796481.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614277f50ee93---bopafujasozafakosanovu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/livafabeba.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zoneleveli.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/rupifadisojoj.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/galutivifupuwenerizifuso.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/vigaxeponididuxemusid.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/pagadokozetugonopaz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138522685287---rururukodibig.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/47215110149.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xexivisujimitapopep.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631312842.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/6984695990.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/27521392628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=save+xhtml+as+pdfPDF 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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 16732 bytes
SHA-256: a6a1ab4ff2e4c5db4db4a06bbcc24d6027a5767312e512fbd1a18efb444ad0c5
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10588 bytes
SHA-256: d0b1101ca1e96abdef9562a4745064521957aa1b9333639c8134b59538237f76
font_02_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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