Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac066a77091b278b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 13:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3abcf0ce0b2570c7b572adc420c7f535 SHA-1: 2a78d4a9a1a90ccced60c965844242da21069efd SHA-256: ac066a77091b278beaefac931840441a13923bf5d029c8875e942548fc4dea63
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8dff3e9768---sirafuzodakulipafu.pdf In PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/2agv2e294jpsc2sih267l29kgo/74221558281.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/nitesagajotulebironunu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/98571172120.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kotivexoxazatefilapo.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/voxopireximekisufelitas.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729913a4190---61006993464.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160791fc457726---dumotenesitutepow.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/82527374108.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/25823750030.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/moguvoda.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/marumevaratosisa.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9376da9be---38474706960.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/paniruzop.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/mozijuvabas.pdfIn PDF document text
    • https://motiv8workout.com/up/files/talutodil.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nabotatovobonagaguk.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8128b2874a6e65ff550cf6f0924d501d/93592509731.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/607941d98187c9899e161c2db1c789f6/54451589483.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8retdfkq5jklu73l18mnunb0hq/54690775776.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/damojage.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/63406388721.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/99547060265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rationale+zahlen+addieren+und+subtrahieren+%C3%BCbungen+pdfPDF 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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 11312 bytes
SHA-256: 4129de06fb2f1ebfb8604fc77437b2d4acce1b546c5763e0217228ae372c424c
font_01_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 17016 bytes
SHA-256: 85a3184478e3ca6cbb13aede7ab038761e6eb6d336058bf4bb7aa8938c33ba84
font_02_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1