Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3d2ab2371482ef…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 10:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2270c81876a17428804c32079c56aa2b SHA-1: 1d0ffdc32811ed959df228900fa30cd58b145a7e SHA-256: 9d3d2ab2371482ef886fd7b8a74ce4445bd753a725a160539bf4e5f83c3a9dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised websites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://nirmalamathachurch.org/cms_uploads/image/file/vegipedozigitibezu.pdf In PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///vanewokenap.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f1ce8af9784a27f005667b6f25a0a258/zojunejanegewab.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/47162b7fc6279d9702259945bbed0222/21966145769.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ca4065139---famapovikexobivor.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712b3432d---26711277420.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/tupexunegazabowadugijigur.pdfIn PDF document text
    • https://grandegroup.net/files/30544274685.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/33c950dcade93cb09216ba1cdabd0f19/27924132232.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gigesufadowimipojazo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2d7858ac57ec3e1966bad6da293a1cd8/24032280687.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/giwazutep.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8b389d109fa12e7b12f1a7fd200f13b1/gatatedurazemogapodoveke.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612955de0f75d---96309441877.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/forolegolog.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/bamogatupopekazimejozem.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42f25b6b3---18791086241.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/134f6b1e2cca07dba49bb44853ed722a/neworijimexuseda.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/pavegojopixewatukaf.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/gisapuvinuzexaxugesobu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/rozibalalewanigunuja.pdfIn PDF document text
    • http://yuha.be/_files/file/33750854883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=decimals+worksheets+for+grade+4PDF 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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 11076 bytes
SHA-256: b3eceef6e61cee7534e115ae2241fb8bbcffa9fe6ff57fba615116e451085cbd
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 17044 bytes
SHA-256: 1f20b7780955b312edc3a5c63b8154d8c85746f925cb0f48c888a520dbb724cf
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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