Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fb0969ca48e846…

MALICIOUS

PDF

90.3 KB Created: 2021-08-09 20:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3517bab4b743bc7d89cdb8c6d840ad5 SHA-1: ae5f0510b148f82951a6455a8fe19e7596131fcf SHA-256: 12fb0969ca48e8464a294264001fd953cc9e60de1f7107010ab54f56e17bcb71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f960d8767---95136258799.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be82b69f372---pogululifonevifetep.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2v0ceqptssh83pcn96c4rp69n1/59274534869.pdfIn PDF document text
    • http://imaginove.eu/data/Files/mamigodudoba.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/bazebigafufatabusatetu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/661fdc4329b9f4c1161ee76a64d61aa2/fumujesa.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/zokajosanabipuf.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/85862245231.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5014796632---rawov.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/mofojamope.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c7e203c10---kapukikusiwadadawijujuf.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160719ddd630d5---80670075900.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/006cs6e3tiu3u7ce1nnpom0ge7/roduzisupolorujapo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/bd2c4125a52d9fa278caba2fd69ce7ed/1447390938.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/fanitetobalak.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/47605907315.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/nenamisenikovivud.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/77560474020.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/278a560c3d8683c551c45f4dac312978/82274557691.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f637b4f066---kidodimafosowefexi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/i4phjq3l5lv5fg4b4nt5rkljl0/makopifanevedawozim.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/82765190329.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607892931fcbd---91058622585.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/11215173039.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98305a8977b9773961a49f6fda8c8d86/nutopakeligonoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=why+is+intake+and+output+importantPDF link annotation
    • 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_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 17728 bytes
SHA-256: cfd59580a4bf87760bf259c8045592b499ef469e8952333979f34dd52384bfa3
font_01_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 10912 bytes
SHA-256: 39694f0255fba0af16f4421e4cbdf407522917700e09df885071f1723fa0ace2
font_02_sfnt_off000141df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1