Malicious PDF — malware analysis report

Static analysis result for SHA-256 496d48c73f7f7d79…

MALICIOUS

PDF

88.0 KB Created: 2021-08-14 04:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b4af6ee22bce5f439159241b5e9f41f SHA-1: 42d9826b3d620d79ba915dfd74bd44d2c3e47a9a SHA-256: 496d48c73f7f7d7971f7f9209402d1b0bb9a8ef80ef4ddf70208c99639ec8bcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=xbox+live+free+trial+codes+unused+2021 PDF link annotation
    • http://sinhorelli.com/userfiles/file/24557021645.pdfIn PDF document text
    • http://w-mill.jp/images/file/46862280213.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c2f6ab986---31149664920.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adf06787be1---31861973367.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/h3pp8ct6bcihlqbhnrtpar1ur2/kaletitebupesukagoloxi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/55976ac5354fc35ecaf8da03b203284a/sefogobufopuvamomalizen.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/dogunumoniwajigetunozare.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/fubob.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/40407434872.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/jedogagagovurirazatubuja.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/768172761386978c1aab963f0754c434/48549832839.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f778bca0b6e62f18273ec9357a5e1c59/bijopopuwaji.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d461ea1b617---govowum.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jhdekrnb7imku510n80escbf96/82825114838.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/92304742694.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/8415106257.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/dufotuwuf.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/xuwetob.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a7fdb724---vasunuxeligozewujoba.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/36495975553.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/11622006963.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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 11180 bytes
SHA-256: f2e509a3dbb09a102ef761122ab0869d115a6cfb408f498ade091fac6a7e4d86
font_01_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 17516 bytes
SHA-256: 9c8667cec22600ed33c20def7a4a489cc23ab52e4a7dc32d6aee040ecbb5da38
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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