Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd95fb69d1074cd…

MALICIOUS

PDF

79.3 KB Created: 2021-08-16 11:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e6ded3064b8e89b1b94054aaa64488 SHA-1: d03189b8e6470fd58a4398288456a56d71277455 SHA-256: ccd95fb69d1074cd60eb6864d5441765af1d00a300c6bd259a2e04ad9a9b42d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/62965896228.pdf
    • http://www.anclupnapoli.it/userfiles/file/98356456516.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b514047ce8.pdf
    • http://bmsorganica.com/userfiles/file/2544222822.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f75d442d868---fopadukojeg.pdf
    • http://ntep2008.com/UserFiles/File/vamobadonovunogugefopa.pdf
    • http://axiomestates.com/userfiles/file/23319131014.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6b9821f2ae073d6557592268248ca258/55914798071.pdf
    • http://xsteelstock.com/d/files/xilutun.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8a226ba95---46870401400.pdf
    • http://shop-exclusive.cz/userfiles/file/89111824461.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/a2ofuc9vbp4tjsmis8k94hmaf9/nebuzexori.pdf
    • http://cbgnfinance.com/userfiles/file/4043291932.pdf
    • http://primethailand.com/ckfinder/userfiles/files/60820699451.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d49c45964---nukumobebi.pdf
    • https://bravo-hk.com/userfiles/file/rotojokatugas.pdf
    • http://mixmarketing.vn/upload/fck/file/83009848617.pdf
    • https://fsreloading.com/userfiles/files/fimizuwegurefima.pdf
    • http://aucoindeshalles.fr/menu/file/ribawavusimarag.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48c9d7ed7a---43628402772.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/56884028150.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ed3066cf---sezibapefuziteb.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6ab142e8d3060a27991325c6ed9eea1a/mavarobebutenubi.pdf
    • https://tortugafilms.ca/adminfiles/file/detenaliri.pdf
    • http://ty-int.com/files/files/zonowibegusakigepoga.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/35936349872.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fiu+channel+guide
    • 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_off0000d508.bin
9e40d9eca6703ee3d0b96937574e9195292c2674d5d818b047b81983fbfae0db
pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16464 bytes
font_01_sfnt_off0001000a.bin
872246c54139972dc2cd24ce4ff58927a4437c6207dfeac350d86070810ba024
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10240 bytes
font_02_sfnt_off000116a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16792 bytes