Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd175c7c580d6669…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 08:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b1b78303966f3f84ab33643c6372495 SHA-1: 24abf5f9df0694e54e222c88ea2d9153a7a345ab SHA-256: fd175c7c580d666978960e3be85c8cc08b703517eb06ef3397c92aba4edbde40
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute further malicious content. The 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick users into downloading an encrypted payload, likely after being lured by the provided links. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://pumarecovery.com/userfiles/files/ridununilogemaronuxix.pdf In PDF document text
    • http://transchem-tech.com/Uploadfiles/files/25117283976.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/lodubugivojo.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/vunibi.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/37483739127.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/latimix.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/selokopugopotujipofu.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/xubixus.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c833537fd362a092662c1c58560e7a18/95288721183.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/newemidet.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/vekomogimak.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/devufuvupojoruxavop.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xetatap.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/23b665146cf33aeeddb8e3f0aa593356/16677513838.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/xerekejukorifipabezanaka.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a70bdb12b---vebol.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52e991c24---gemebilawepujologik.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/59820402044.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/36544034753.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/katidoko.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/5418731155.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/6943746914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+v+ppsspp+iso+file+download+highly+compressedPDF 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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17580 bytes
SHA-256: d847b4255fd681b5ba9293d41d83b715d2ff5a7bcf2e9fa8996a12172c0a0549
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 11372 bytes
SHA-256: 2a25194a692d17b87de185b9b3edc70ff026b0551ddc931d91f2c702c39441a2

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