Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a0b842f92267ac…

MALICIOUS

PDF

92.5 KB Created: 2021-07-13 03:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e31267d42a072e1b9ff3ab030db5421d SHA-1: 6cfcb6b7e3c1fe49d914c4f169148e26da4c10e5 SHA-256: d9a0b842f92267acb555a34c04959b3d65759df8ae5cc3628e8151872c2d8c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabe12cccc---86564967766.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5206b51e8c---sepejanedibafelenixenup.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/85954587079.pdfIn PDF document text
    • http://htwy.com/upload/file/kemol.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/dipuzutorekekiso.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210712_ABCE1CC370AF6DAA.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/99bd57b2baca2c7f5b2a3d82b366c3fb/65496497500.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/uobssugljmut47qq2ve71nlo26/tonuzutexebilewov.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/68091172935.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e0caa22884f7a99e1ce82f54fc4f61bb/33118960873.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b6c09830---15740909164.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6140b0a0b9---45588324121.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2b3ri5v4vl1toavmcleoeo8h5/xikufamilejokulatapij.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0d8ae37342133b3a59b76c3268e5c444/69191930795.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/fifadekoworovev.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083947b80cb4---37576155178.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f56c6cfc2---39856388552.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/43154985425.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/64061775183.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/susilekemadutafos.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ff754aeb700283e7a878a63a18f59e31/13535914467.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607de167952b7---xusabinegebufebulijufi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9828a598e6---kisulagovisidepenumibefeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+most+dangerous+game+scavenger+hunt+worksheet+answer+keyPDF 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_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 17568 bytes
SHA-256: 2996d2477578459c4051ea489e06c8eec3c2cedcf6b16df0ddb006cb9d7b58ac
font_02_sfnt_off00014aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAC 11100 bytes
SHA-256: ae673fa239ad41ed70f77da0f4aa839beef4ae792093b041793f122a6b1db6e8

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