Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb979458c690fb91…

MALICIOUS

PDF

87.5 KB Created: 2021-07-21 22:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df25674a71365b2ca0e9eadbd72060e9 SHA-1: f45862dadfe60a06a747049440c6931497ba2bd2 SHA-256: eb979458c690fb91b7b21d082fd1d2c29ea3cc18549ca9ad669c8feb2f0f8bcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cs0h7dhvtclsl0j74fl08jp9br/73756187425.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61e14f813---ruvupofadidonined.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/8514999324.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ci630ie6vs0rebv0cba8des4d3/60244795350.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74e6df766---lemidovanapipori.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efe7bbfc6---58618194248.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/9863942866.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/18312162393.pdfIn PDF document text
    • http://iwishop.hu/file/marigozotop.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/89000753167.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b8f7f5fb---34571775237.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/6d63c4ed351bc06462ab1a3192a51de8/39621429585.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b6608e5f0cc73106023af1ffeecb8288/tixuwegariwanuwoxogilezu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pofulaxu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/nodunuzewataginosa.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/69657085267.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb43995ee---relogekafejiva.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a4e3f3064348ce32a891075382549246/53047547868.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/35439902349.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/50184667684.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1bc1486f---dazubetipuponixaliwune.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f99bd76311663f5898b98d47ef9b32ba/guzifujidukobadepojotud.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/94109241925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+does+the+bible+say+about+the+ocean+in+the+last+daysPDF 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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16808 bytes
SHA-256: 9adee605f7be9842c1dda1d911d30d75f6e3f3f973425aa9fb47f220c22c9b97
font_01_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 10712 bytes
SHA-256: a01d512d390dfb675829e218894e10816fc26b01f9df3989562e524179e2f4df

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