Malicious PDF — malware analysis report

Static analysis result for SHA-256 230148ca6c3b1d96…

MALICIOUS

PDF

86.6 KB Created: 2021-08-13 11:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07a0171c5c1e38c7b002f611aa5f6af3 SHA-1: 5570506d90e6c277f08324a1e0770e64fc62c142 SHA-256: 230148ca6c3b1d968d1f651ca45190aa0b2ec6350f90fc58ba00d162678f9f33
236 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it is a link farm and contains social engineering lures, specifically instructing the user to execute commands via Win+R or a terminal. This behavior is consistent with ClickFix attacks designed to bypass macro restrictions by tricking users into running malicious commands directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce56d6248d---57405502878.pdf In PDF document text
    • https://nhahangbienhaitien.com/uploads/files/21929406404.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ff1a0350a---tisepedutevujunixej.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe22630b0---14269188974.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/litimigeji.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88d082c04---29046378380.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa87cec12---nenafalitikup.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/lepaxovirip.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842e69b41---98926350525.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e8447895---tinevonulumizugitap.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d31d8d4b709eac3c4b97881449232004/guvugaxelusitenobosabo.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/xazodafed.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a431bb984df0ca90f849f7e3a74182c8/jatukusevutokole.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/ruwenezewosexetekuza.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b3igied0io2th4ce9c2pbrjs26/doxevikapa.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/raluxapolirasepomozereko.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/puwatuke.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/81cb345243991696b456018ff1b1a41e/rujikuguwafiwifafonesomoz.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/zisonuwoneporupikeb.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/2544390522.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/zubidawido.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b142452ab1748806b4c0c0cf00d0803e/levutam.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5541c5f88f---fidujunasedivodomog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=command+prompt+windows+7+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/wipoxewipakomoko.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 17128 bytes
SHA-256: d46c37c35802f23d21b5a5cf307cd37f48a666f8626337587ebc610daebc101e
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10588 bytes
SHA-256: 8da3a9e31ac9910f12f5fe00f5419bca25a825d5135d29274cc52f75a9a8fac1
font_02_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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