Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f995f14dc0220a1…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 08:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7390bddf97cd3cd4427146708181e722 SHA-1: 28e16ef7c73022cdb374bde6dde617111fcc85c0 SHA-256: 7f995f14dc0220a1a53e6db8d94662ad2b34a9614ca485851bbca5da3692330f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://nomylo.ru/uplcv?utm_term=nsfw+pokemon+rom+hacks PDF link annotation
    • https://istocdukkan.com/userfiles/files/zusodenu.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xugagekikiwopivufe.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/52165436804.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/rosenola.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gekisebafabelidekomuradu.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/36408374758.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vuwulirawed.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/87399060871.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/faguju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f6aa19494f---31771795485.pdfIn PDF document text
    • http://chaireyes.com/v15/Upload/file/2021923054202465.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/4821124133.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/47209312478.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0218409fc---ranudavuzibe.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lobaro.pdfIn PDF document text
    • https://dhesient.com/media/kabebebepo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462339e878d---36114642468.pdfIn PDF document text
    • http://scarpatti.com/files/41162437736.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/sujekopufakubitixusozefa.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/59680220127.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/lawikurebuxok.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zinuvunu.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_off0000ad01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 15128 bytes
SHA-256: 4146cd295be8c0c2ba93d2e34b4beb284aaaa629389c2a139a9884c442aa1aae
font_02_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10664 bytes
SHA-256: 010191a915af1a1502ceb3e3a935e33a69e2ee140939d4e4c75619655a0cf1e4