Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cf14aed1997221…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 23:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d427b5a712f017c561785112e6db6a88 SHA-1: 434a262dbceda6751384035a88b907ecccd24db5 SHA-256: 21cf14aed19972218f743cf3151cdef719319067d66139d7b72bb5e069bbadad
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple links pointing to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to malicious PDF files, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The embedded JavaScript and the ClamAV detection ('Pdf.Phishing.Trojan') strongly suggest malicious intent, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f721f0b---navapemomemegovuviko.pdf In PDF document text
    • http://guoyangmoju.com/userfiles/files/zajadegirusajolovefe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359033f1bb6---wikowitoruxixarev.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/77321754698.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/xunejij.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/borekonubevikojejeluji.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131221023cab---fagunewovuta.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/zilovivevojupexogo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259244db4---92121946672.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wofulewefubigipise.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8f2f9c1131389bf9a9517de649ef2023/fejob.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/gefujamagafisanon.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/53754920821.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fap3kg80ag2lcpdkndgjjvimp7/vivuniza.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161427a40acd06---62869044020.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/47265689342.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8fd19f770cb2bcd58c99552542f1cb73/zazanixiduwigadimupupo.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/66074927129.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xafadi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/virezogodenijaxu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcaf64210f---weriwiruvajajovuburi.pdfPDF link annotation
    • http://ikuma-car.com/js/upload/files/tunikefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=voil%C3%A0+ai+artist+app+downloadPDF 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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10492 bytes
SHA-256: 6b1b34409e1397c7e50efb0d787f59811210d87de1f292124817eebef441bef6
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 18996 bytes
SHA-256: 6c5ad5c42335c2f225309f7dc235d7ebc8e9f64b0622b5ce0d2470fdd52f51c3
font_02_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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