Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d3402574ff6843…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 08:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3daa5d961df98aae14cd96dc92eb7377 SHA-1: cfd413f4a329e648a1e913bae1c8a917ebee28b7 SHA-256: f3d3402574ff68433ce30ede69b42d7c76083423af79fc819d88883008517541
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The sample's structure and embedded URLs are consistent with a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qvsorbuvjpf32fej6sssbhe641/xukitiwemebapefotani.pdf In PDF document text
    • http://detikakdeti.ru/img/file/50788146837.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/76423638448.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/46967485025.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/df06f375877124a411688b3a0978b677/nawuvemikinesulireni.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c34f3fcb786943e0e01396d5db1aefab/38158135251.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7l0nodr3a2vsdcat3s1in0l4lu/tikuv.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/27670235068.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/padebo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ki9eur6bvmh1s0gv33gvjq2g35/80907303988.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984f4a09a7---72009966881.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5c3e07fdd91f68ec43706ebd4b73c958/lurigufukagofugekizejaza.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/fiwajunowujegibifej.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210627_3b7c8.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/jodobita.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766b549a77---80799110654.pdfIn PDF document text
    • http://aps-mes.com/files/file/xevubipulubekuferup.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/527bddb5e2a9cbecba51f59fa0f178e2/26570352418.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/819b9d98b5e7d4ba8d2ff966882c537c/68181070184.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1f06gpe2ptnjeuuled81o27sqh/50455507066.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29537901067.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2685b89f---nobanodorewowoberapem.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/sisorutupetekefusunemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mouth+and+tongue+sorePDF 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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 16416 bytes
SHA-256: 66f1c4d9d3352f2b2f7f324a82992d33b725ead9ad85efb64d02e911fabe82d5
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 10484 bytes
SHA-256: 53456dcad192b4a22aa6bf1652d7bae7425b17bbd00067ffbc89feff912cf451
font_02_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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