Malicious PDF — malware analysis report

Static analysis result for SHA-256 71957f8cfd58c04d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 23:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb5cc3df24d443b9e485f41d4eb23b4d SHA-1: 72594adeb1f326978253c9fa8c1d9f33b71b6024 SHA-256: 71957f8cfd58c04dc3639c2cf3fde5c18cc2740caf2d5bf2142dcca64f4140e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=how+to+reduce+the+size+of+file+in+pdf PDF link annotation
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf9a371e9c---wofufuguroxupelolaneta.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/gedisug.pdfPDF link annotation
    • http://brbud.pl/userfiles/file/todewanixowawunaremo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/41829579151.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/fezobi.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/70179052569.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e7d47272---pinabudazijufuna.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/58600298303.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/vedinil.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8617349f1869ff5515c68b3bb290aaba/pifotuneduw.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/fagokoviwogavokiweroni.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcc7e1619---94834323476.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/36193596717.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/68539941968.pdfIn PDF document text
    • https://funbugs.ie/files/file/62429337832.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160969d964c53d---fatapifanifedal.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117c29a48bee---rufaj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37097bdf9a---jogebiponasi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fb714980d---50190197424.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbbeeb251---kozodurigojeserafam.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/69914264732.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0176ff1b25---wegufogafejulitofinef.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3268e6412e---gabuvumulagezexeze.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/xipebiwibo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d878a015f07---67642701185.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_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 10792 bytes
SHA-256: eb6fb321990f66161511cbe7ea9c4f79d650484fab61033ecf0a4abf4989e4a0
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 18444 bytes
SHA-256: 185df73027bfcc4f66609f010761d87495f50834dd35718d1eb45f6a993e1fa7
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1