Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de61cf228afdcb3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 02:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43a96879b1625a8ef58ed683a6a1c935 SHA-1: 136cbef5a397b7d3d7cd327df4d79529457f70b4 SHA-256: 4de61cf228afdcb3bd530a3770d065e3b122828f7035ee31e14167bb9ee6b20d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript stream is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://lyonsinn.com/nbloom/fckuploads/file/fedumape.pdf In PDF document text
    • http://tataservice.it/userfiles/file/zexesa.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zirefojetekovetujewe.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/fisusoposizex.pdfIn PDF document text
    • http://royalgroup.at/tmp/dodusaferopamam.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/50972633797.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090819532496.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/gorux.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745ccadee4---87473056738.pdfIn PDF document text
    • http://snft.ro/media/file/belamuwerobumele.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/xupatixa.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/vikazibet.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/71901503550.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/dowajab.pdfIn PDF document text
    • https://halkum.rs/files/zilaf.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/25650219669.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kofonozalanuxolitukiz.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/sixemujozerukudinoxogowa.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/28214156366.pdfIn PDF document text
    • http://holzbau-napetschnig.at/3281125670.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/69935842491.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16138b04abb0cb---50702578376.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac945d9bf68bdb435a92e523fe1140f6/71000182556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=win+a+free+iphone+x+spin+wheelPDF 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_off0000c6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 10540 bytes
SHA-256: 9f07fb76d8defef76ec55b6eb724cbe0a8cbf5dc24eb3b744db1d600202e6718
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 20616 bytes
SHA-256: b4300b3c64d7d5f077204e65f89c6878d283e7c65cba966e101792db0df1ab48

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