Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc3ed86abe7e57e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 14:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2812664239ca4432d0bb4bc8eec203f SHA-1: f3863b588e9b5ac32c3d839680a379b6a7ce9796 SHA-256: 9dc3ed86abe7e57ed17ccc8b5be2dd5c4a74a68cfa91185c12614a621a232e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=the+pebble+and+the+penguin+2 PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c7f7636c93c4cce8ef0f86e1fccf669e/77045054917.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/repegata.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/391332397.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/55906914699.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/74387898680.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/31221468722.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/57319074432.pdfIn PDF document text
    • https://rcot.org/userfiles/file/daminitejimatidibaluv.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/55080254589.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/fuvoxanadodivime.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132a4c19fcc6---62528101455.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/53440579271.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/72630646479.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c020ad2c3---pezijikonop.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/33198225419.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/6191604065.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/jovevewugub.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/6094813592.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f85d89c---55742985762.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/jatimusovewa.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/sisomudatomebemumed.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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10608 bytes
SHA-256: e8fab9fda7c47c5d818a14a7aead853ee094edd21f698557e4339dcc4291c1d5
font_02_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16992 bytes
SHA-256: c2f1a0ad9d0a06c1fda9010dbe2374c24181838d98e78f86b91dd396310c8811