Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b97f6bf284e08aa…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 12:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9cad6fbe6b5d3c586e1afc73828eeb7 SHA-1: 06df274ced52a0fa92f9372db2530c75bd8bc728 SHA-256: 5b97f6bf284e08aa33f931073a8202eed032f7608be905b773a1cea08881874b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=soil+pollution+analysis+pdf PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b39b0791b32c0633789772dc94a0f0c7/26264910534.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/lanofi.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/zumifejopalopodiku.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/15a255c283772021a898d813579536b2/42953447262.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/bevirijagida.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc4da8d75---bagurewutosijubuvum.pdfIn PDF document text
    • http://mextro.de/upload/files/72526003402.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086483aadba1---godil.pdfIn PDF document text
    • http://pr-dienst.ch/file/majaf.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/59321383498.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b42af39ec8f---67588118986.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/mutulorudokunep.pdfIn PDF document text
    • http://hncastlecable.com/d/files/lerofarikup.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/fifegugizufasagi.pdfIn PDF document text
    • http://bjallstar.com/upload/file/60598585651.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/favotik.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/rolisazudekajawegejifof.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d0e6a5f9b3040bb34a6dab4192adff58/sababomivekale.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wozudemoled.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/335a20241288e95e47e5c3a3f832ec15/kukogew.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/10387232619.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gefumubegefisewux.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gemuwovojujujika.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_off0000bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD38 17620 bytes
SHA-256: 9b6b7caf17d61b890ed00e7fa36daba8e7400bf2407bc4354c5930a39908ca40
font_01_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 10548 bytes
SHA-256: 2956348ff7b54cf9476fff3c1c7336b6f75961768c30e21860e5282a58ad91b6
font_02_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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