Malicious PDF — malware analysis report

Static analysis result for SHA-256 b429d05b90246f7e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 07:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8671b548b226e2e1e2f3b671b5d7816a SHA-1: 6a8d65479f91abc337e78dc8ee5f7a0e8de60ea4 SHA-256: b429d05b90246f7e8c9d1ab8ff65e688789d8cb21c7bf7f59dd68d44a8bee5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a86a5663b---13798840399.pdf In PDF document text
    • http://rjt1.org/upload/files/760283609.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/katajafubibozojavezomupem.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed08dcace1---30216050619.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0815/17bb8100844a5171de2a961d15ec02a2.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eaa7bd8a---50504815247.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/tuges.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e2b60174---kowoxalenoxuwirixejoxa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hhjcc0dqg1e3rosb1e80t2nk2/90523276096.pdfIn PDF document text
    • http://446888.top/userfiles/file/38058038905.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xovaruxujowawuzibebi.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/virivolowekelezegut.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8c52c90b3c5ce9456c7487d30cde5d94/taremidimodomisadubipuxig.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/merobeja.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/vezakexemo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075567a32dcf---24119796010.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bb39bcfd435457fd172385cb7b9b30ab/sasimesatifiwubeparigobe.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/da54061bbe7584ca6da84e9a697579cd/gusekaw.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/sozaresumifusulonujizigi.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/80479520487.pdfIn PDF document text
    • https://efnnma.org/files/file/22274103250.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fekunar.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/1393543529.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/jubigoloxewasusego.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2b5a718d---30334936323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=profana%C3%A7%C3%B5es+giorgio+agamben+pdfPDF 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 11260 bytes
SHA-256: 58f689823b2ccf7f585e787b15102147676b03eb673b576d0a07a4107c8f39d6
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 18180 bytes
SHA-256: b384d2de3b801fc4cfbc1e642f945dc63e89df41f125162dda3931e72fc35cfe
font_02_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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