Malicious PDF — malware analysis report

Static analysis result for SHA-256 caadf0d2c23ca8c6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 20:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85b03d1d91fb354b5151f6d646d82661 SHA-1: 3fcba3466ecf09cdbbfe9c5cb9698f429f49af32 SHA-256: caadf0d2c23ca8c68efb84c28a6883066c05878e8078a6c8f80d94fc78503231
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript points to an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=instagram+auto+liker+free+500 PDF link annotation
    • https://valleyrentals.com/userfiles/file/jobuv.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kagexozasasa.pdfIn PDF document text
    • https://clubon.top/uploads/files/40759117414.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/pojotufulibo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140be59ddf6d---18829677810.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/55963562920.pdfIn PDF document text
    • http://client.diffuse.info/files/mavikan.pdfIn PDF document text
    • http://www.corpeverest.com/ckfinder/userfiles/files/fuvulegadesekatubatuxik.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/rilamuridoni.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/rimoxiziwidenizafe.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/balozunevudokavipodeviv.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fidokuziw.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370a68622ac---96475698481.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/salezosavani.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/dakuvatarasarimopo.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/52541594753.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/14735265495.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/71158521992.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tc6srd95c7cvq4vfkl7rdcpf7h/basilulilunalefinemef.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nemikumiw.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/7460644643.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/29892423830.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/sipoxibabagaxafif.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wurosafadiza.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/49832802522.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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 10956 bytes
SHA-256: b6ae1444f8b6ab32bc4d85d130685deed9e7cb58aa899c0ae9223d84b4d56c0b
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 17620 bytes
SHA-256: a822d1e5b6cef67600a259cbaa328316a0cb728b0909f6016c06bb788569adec

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