Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f9dcc3643ebe95…

MALICIOUS

PDF

89.6 KB Created: 2021-07-17 05:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3004b060ef92669e080cd43cf810e18f SHA-1: 8b87b4afe1dc3ae7d7e009f04083980aea269062 SHA-256: 98f9dcc3643ebe95f688a104a01b1f5f298d00747b6769892fe950ebef21625b
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool. Multiple URLs point to PDF files hosted on compromised websites, suggesting a phishing campaign aiming to deliver a malicious payload or exploit. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8729e7ff4---zaxefegefuz.pdf In PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zobowoso.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84bdb146f---84504279987.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/oqu7ba8ki7ibkkh6s3vd2efrvm/vojazosilogi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/finotuvujikofetoluvezod.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/edddbafa1e2afc204379edb3c3e8c47e/wuwafuzibedaw.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mad9kel6tvnudb2mbh9plh7124/finagewakimevituk.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091062f18fb7---85268573051.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d01fd08f5c580a2edcf9e1635bff3035/47920606744.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/kivis.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/kagurevotosarodolalusa.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/nagitilufi.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/rexeri.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5fec798bf---52809464864.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/xobuted.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c0efaf13b6cfa82cf21137c0e7a18506/96651567271.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/kuguvi.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/17638149491.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/25774242227.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bdad11fe58a68efdae866eec1a058069/31634243922.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/60112237149.pdfIn PDF document text
    • http://beateromer.com/bilder/file/jopovareta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+portions+of+dna+molecules+that+actually+code+for+the+production+of+proteins+are+calledPDF 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_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 11064 bytes
SHA-256: 802f5a11422cbca03bc3602ca9557f55696522937c43edc14634bea423d2078d
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 17300 bytes
SHA-256: 5ebad13f0ecd0404ac95b8d9b1e98ebd998179e2dcd9d9cb67523d1a7d95698c

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