Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1c693dd9b4cc8c…

MALICIOUS

PDF

94.7 KB Created: 2021-07-24 17:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 971d3b384f3cdb4aa11f301f4e0d85ed SHA-1: 56de66ac6f126f88a205261da6feafee75401fee SHA-256: 8b1c693dd9b4cc8ca01816a529ea5d21cea0d79422f31ac3e24294eab440da07
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a social engineering attack (ClickFix). The document likely contains embedded JavaScript intended to exploit vulnerabilities or trick the user into executing a command, leading to the download of a secondary payload. The presence of numerous links to potentially compromised or disposable hosting sites further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abacusnancy.com/userfiles/file/86970285673.pdf In PDF document text
    • https://norservis.com/files/files/23404024633.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/tamubotenijosukoxap.pdfIn PDF document text
    • https://bczenekar.hu/files/file/51872026419.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vaboruzotera.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087977894b1a---47057359231.pdfIn PDF document text
    • http://it-hair.com/userfiles/juxesubalakazurema.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/fogogelogesanebu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8a392b66---kesuxoluxebusaxezevipaxu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9be0996067---99123622155.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/jajenujozimogeki.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/fb6574fd88bcd492c21a00f606953a20/mituzulumesexe.pdfIn PDF document text
    • https://dm288.rs/slicice/file/guginogasusabusajovisete.pdfIn PDF document text
    • http://wjcopy.com/upload/files/wadefikiraruvukonuvaga.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e6746262---14127265940.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/76dcd0276793c40598e45cc1d5f649c4/96668945670.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d94f72dbf6---21712929838.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c41eef5299e---64250144750.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6feaad309ece0f2bbca0de1a9643f66a/saluwif.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/nepebemubafufukomewirab.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/xaxabetubobezuno.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/63550707072.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210705_0911DF2DAD12D94B.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773647bfcfc---tumizamowiziputubifezum.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce9d5ae27---68928901973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+optifine+in+rlcraft+tlauncherPDF 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_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 17572 bytes
SHA-256: 2ae13ce56365f01e63cdcebe578edd6327d17f8de5a2e9c78e63f0acb1dcc128
font_02_sfnt_off000153a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A9 10756 bytes
SHA-256: cdd7961a0ae5a9ef4f0adb9d333068d233b3efc4b5f217bce7a17bbb81a67124

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