Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a553ae015fdb8c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 22:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 232ac9afc623910d1220eeaceb5bbb49 SHA-1: 8ed51870f29215c68ac99fc9e6e64e4e675bc04f SHA-256: 87a553ae015fdb8c3bdf3b33c9e6217956542f0bcfb1f707715bd2f75a02f2f1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=capcut+editor+free+download PDF link annotation
    • http://allamericannursing.com/userfiles/file/dugetozovuxu.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/kaladedowupirodoxed.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/39386486591.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/gonevivirugewenivatas.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vewexomuribagutepaxibudem.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/3449412366.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/24500f78e71f89583cdb19cd9285a316/volid.pdfIn PDF document text
    • https://kiptep.ru/file/74957384356.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/62115876896.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/fusedovexipunopi.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/75723412084.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/85940770559.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0df937b7---doredisowokusinu.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/85197161268.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vidafativ.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/29912294723.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xetovobumizavineruk.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/bozumatebakoxe.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62703800047.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8dc61a9b2ec0df30d46dba0c98c9a2fb/maxutuxukevitinum.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gowunefuwa.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f48f548c605901a1df9a7704c6880f73/ketoko.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/xixukufuxojefojepatovopu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7f30ee30---femapuxikiko.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/83687456165.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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10660 bytes
SHA-256: bbc7fb3f455f20862594d74dfec1e802728ca421e294b1447f7159271a9eff91
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 18560 bytes
SHA-256: 2ff3952367dd6d8872d47e03fd7bdac67ddb3258b878674e39c6cc400dabb807
font_02_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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