Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12940cd1256811b…

MALICIOUS

PDF

102.4 KB Created: 2021-06-26 21:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36a365532127d277fcf3eced2f43fcd SHA-1: 8b803ae69d440ce3004f4f690e0f86f6994270b4 SHA-256: c12940cd1256811bb4bc3ca332f835b10631d57a24c7f2e6a474d817a1293d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://acryl-bg.com/userfiles/file/wuradinis.pdf
    • http://alnoorcity.com/userfiles/file/42827184908.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3e1e0a6cbc0080666e9d8b2ce35237b8/busozoxuwaxerogak.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0c88c9b0---20663980533.pdf
    • https://dcimx.com/files/rimifa.pdf
    • http://analogsys.com/uploaded/file/366427842608c0568c3521.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95ed462b4---pikejetadimetedugaruje.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6b9398f3b---33328872017.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/93547555364.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/zunevuro.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9305137d0---83689572116.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wanisotekinexegiwe.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b56c434b---8269292925.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc4eb9egnuo9pkab3pjemrhgev/60881640273.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/q8aargjqcsi0l9k7q62fgcakns/1171076217.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46b805cb---85946727532.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f2accaae0624910836374fd600ff3528/pefosok.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31953a1b55---90776211649.pdf
    • http://nsdadventist.org/FCKData/file/17991271132.pdf
    • https://cottonweb.net/userfiles/file/18767541930.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986917137cb---zaguzorefupasedinudowa.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9efba612b---wepepimopagipabobu.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160801301daf4a---lumomasopedewegite.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6bbe0fb33053925503c95dc9f86e23eb/3933814720.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tralee+to+ring+of+kerry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ef7.bin
c65a729f68ed3a9a964127a492cd3a4fe3b29b01066f41913c75d64c28fa5b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 10388 bytes
font_01_sfnt_off0001469a.bin
902ff3188fc6782c3f23659bd8033c6f76ec4bcbc572a3244f924c8a204f74ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1469A 17616 bytes
font_02_sfnt_off00017470.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17470 16792 bytes