Malicious PDF — malware analysis report

Static analysis result for SHA-256 289256c19a73496f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 04:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01d14dab4cc04f772b0ede374a875b76 SHA-1: 4faa368969b53e5624f0563ec9c00ce97f341393 SHA-256: 289256c19a73496f372334bb2935504dfe0d74301ec802946f0f4b2ab7a9dade
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm intended to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://philabc.ru/uplcv?utm_term=where+is+fingerprint+sensor+in+redmi+9a PDF link annotation
    • http://portaldo.eu/contenuti/upload/file/paxebopabab.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109060920412142.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/buziwusifibogokurimezuda.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/wevafiviwegilizazepilif.pdfIn PDF document text
    • http://marymo.ru/uploads/files/93726309781.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/22149596519.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/88320679135.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/96843629785.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/fubogemejasujelitosov.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/ritasogigirosi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1b319a35---56835465568.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2649d4332---nuvote.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e701bec552---rexaxaba.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/79022454477.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/xusakelirinexasekusani.pdfIn PDF document text
    • http://apicn.net/upload/files/85716044432.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tukivarine.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/gazukogezogukisute.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791d09f6d1---vositakakewebuxujegifiko.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/38595079754.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614679cd1bcd7---xovovamawabosazilalibane.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a520cf2a---gawororitef.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_off0000b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 11060 bytes
SHA-256: e5b94351e05881facdce425dbdd728b8575b536f38735ddb243a8929a3cae635
font_02_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 16548 bytes
SHA-256: 90543ed1f884ba9111b4b9e0ae53a0022efa5bef6d60b9bf400436e6595348f3

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