Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43ad2be7fc89016…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 17:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c19ab119631d05b64cc9235cea235716 SHA-1: 6373120720420ba072feb1134bf664d48f09fbf7 SHA-256: d43ad2be7fc89016812ee9aa5bf91282f7ea4fd9341be496dcf35fab93228b06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' further suggests a phishing or scam pretext. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=create+pdf+using+aspose+c%23 PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3b3bdb30---51262550408.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/26245564835.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/88344689449.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c15f376a---ritesitafeguboxeteluw.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/nadexi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ueanl55ca0bmdbt0dbct48tp65/37617697761.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/65686306880.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/73665598604.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/99836651725.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf3e9ec420c29876ae2fd9be8c9c0c18/42425801547.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/mepatizibigepunawud.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vigeditabor.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210703_D3348DDEFA7034F4.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/3855813491.pdfIn PDF document text
    • https://2acontractor.it/images/file/66243460025.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/38e940da1d28a4791ec3752314091f96/70651856687.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4c469dca0d698366ba39d732a6a55a05/namovupux.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/urn5knak63knd0n32m8e651u60/gotemelugavise.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965d4cca40---27956904003.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb51c9aea7---50303612257.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061701091273499.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/jojumifolu.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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 19088 bytes
SHA-256: e89b448a2035301fa59f75721eb217e12073d04c1aecf3b0122bb2365e01b432
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10880 bytes
SHA-256: fc17555bd993b88fceb8b97f283242096d167ccf4ee21b735feae7d6cc85eb80

Open this report in the interactive analyzer, or submit your own file for analysis.