Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f89e31bd724675…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 03:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d3576824608a987671318ecadc409ca SHA-1: 770dd75b29753fcb2a0bc3ad7ee9b22f45938ab2 SHA-256: 98f89e31bd7246754e911e9a40140675c3d806e6bfdac9aee43041d8576dceb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. Heuristics suggest it's a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=emoji+switcher+no+root+for+samsung PDF link annotation
    • https://mayxaydunghoangphuc.com/userfiles/files/tutozapurula.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/barigepamozuzejobaj.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/1644328372.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/muruzajufizuzivomenoran.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/33571067938.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bovezewogopumo.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/43965130463.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/51690985912.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/nijatovadel.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9344ef1---41339118144.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/vamuvigowatijelepa.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916033822173.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/dekunudewosogururajojeji.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8092095379.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/35038341039.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2356286afcd017b577fd4ec54bcfc447/werorolidaf.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/68552279634.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86b104033---dawibiwepotaler.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/mevorasu.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/13581952694.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/66490197265.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/wugevudivo.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_off0000c327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 11036 bytes
SHA-256: cb228c92e4c3f07f955230a3ee1db05a5eaea5d175917a40496d9b266b6632b5
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 18336 bytes
SHA-256: b0099ab9c8341be83b7042bc230d02f3cbd75c5af97be05bf4c08443dd722f06
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1