Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff124a9c1fcd50b…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 12:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c809c0dbbfa50177d98977b29d743be5 SHA-1: a6748a3d13e268f225d5f2f985a1027405f8c729 SHA-256: aff124a9c1fcd50b505f92fe351cde0ef892a92d6a023db777348762eb0cff0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://krisoc.ru/uplcv?utm_term=origami+box+with+lid+pdf PDF link annotation
    • http://sikahaiphong.com/images/news/files/54544436992.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/18770650885.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2bea00eb3fe758bad7f1957e430f8d81/fazuwekemijulexubu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3963_20210626010938.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/14380472ffd647a00ea54f9b41520195/17208976356.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf3acc7dab179bed2c79e7226d24a4f2/fixirerozesodib.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zujakuniwefalub.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xagovowuz.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/pixojokijenaw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ba20502ad---39586513417.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a9beba777---2477431905.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/cd0cebad85d519d111892e5b2fc265a8/kunuvobisatib.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/35235730542.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fd327254cad970fa8e07220291ef24cc/5860489495.pdfIn PDF document text
    • http://mvhs78.com/clients/68382/File/rufurinufugetetag.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/figaxobawebuxebejab.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdd9a5099---sazaselajonafuredufaroj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/41e7414c2c2ad266f36d7ee5fb5d9e4e/18402811414.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e533595aea1a450ac823c08a29274f85/novutawekagofufoj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc18c9582---pobifilabegifujitamazusil.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/98647297766.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee5a58986---kudesakarorabogosuzaj.pdfIn PDF document text
    • http://headrepublic.pl/images/files/8651859263.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46dc85625---90750798601.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/r4sr231uk2qs2c96f0caktffp6/dorigumipurelesone.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6bdcbbbc7---62175472210.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/navebobuduwomefo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013705.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13705 19232 bytes
SHA-256: 37009a22c4c02abd6d07775a53e1343f4420ede773956b9f08bf322225e302f1
font_00_sfnt_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 17800 bytes
SHA-256: 8f6a91db82278148d826d5438a527a3ce086cf33b6eec767e0ce49a6950f5991
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 10896 bytes
SHA-256: d67c0653e689e7397f0e9e6a44cf0231390ded1a548c5f578c6eb574f24f5458

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