Malicious PDF — malware analysis report

Static analysis result for SHA-256 403db0513de42f4a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 20:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d493ff9ab65051b670c05b69fa841d9 SHA-1: 84d856e65eff563038f959adf839b716b17aa5a3 SHA-256: 403db0513de42f4a4cbc52ca9939efeaa223c02a9bc3112bc5afeb403a28a4da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=waste+consignment+note+pdf PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8a8ba52f9---puxakadebuxefuxadagedozaw.pdfIn PDF document text
    • https://edusfera.pl/upload/file/2722607098.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/zodawoninasotisirokozaj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tulogutipojadifezutaj.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/45463578929.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/teruxulakipekojivanag.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/98767130641.pdfIn PDF document text
    • http://simonide.org/userfiles/file/12822218728.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/88831979732.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607165630a966---kusakonabediwofov.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kojirisow.pdfIn PDF document text
    • http://suurelepa.ee/data/file/31527953319.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab735e393---14394695054.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/76761419088.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mawilijenusiriw.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/98139518237.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a6d18ee1---mezuxexizalej.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7973be6d---vifole.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160785335c3be2---29009929707.pdfIn PDF document text
    • http://congtyvima.com/images/Download/getafil.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/jevukib.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/16868768395.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/bokobanez.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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 17420 bytes
SHA-256: e3c9374cce132cf92d2be223bd1e7323822c5b5db2fe329cafd64bfc150b50f0
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 10812 bytes
SHA-256: 69cc67e7767b64bb0831786a501ab8dc92678210afc972162b3737c34d38b678
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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