Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0c1f78d8fd9dc3…

MALICIOUS

PDF

90.1 KB Created: 2021-09-08 04:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7c89e9a5907035e61047febb6e05ae6 SHA-1: cc1184437404af6eaf07060bbd89eb57c55674db SHA-256: de0c1f78d8fd9dc3843be3349ee1820cb6491c02ac0cf812f5f3c9d5fe9d1d13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catamma.ru/uplcv?utm_term=funciones+matematicas+bachillerato+pdf PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ff7d2f2984b25b13c90d867d7c749cba/71464568529.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f06636bfc872f5d3c95c902632fb93e4/sogegaluvob.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3a2802de---juximawaxobuzefijud.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/33827598764.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ri15gfer1l63a9vf00u7j7j0a4/99782269533.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/jadamepi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095d62d51400---kazomuluwixexevadefevujo.pdfIn PDF document text
    • http://aplus.to/userfiles/file/riranugevavifapenunuzev.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d101b9978e---buvokebub.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l8e42553ddjq9kise1eft9b0v4/fakikofa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d499a5ef5---fipoxugexisun.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/36671680925.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef2a2f7c435db96cf467c5673f81703f/54109391554.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fcedb21d---97750567626.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/rajivetuxebapadezubupit.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/43574718050.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/zirupivewenetidi.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/61019486646.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/52079557885.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/39566218961.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/8809537457.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/walizegu.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/girolitanumove.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/nakejukozov.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772be453f9---17680944988.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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 11104 bytes
SHA-256: d5b53adcb8911c195378c74e6ffe09aca37ef7865f1cad32c137aae3b97d9894
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 20664 bytes
SHA-256: 416af54e1a7b996325a8ed140926634facd0edcddd0dd520cd3ab60c8d0430e4

Open this report in the interactive analyzer, or submit your own file for analysis.