Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d0c3431a48d0ee…

MALICIOUS

PDF

152.1 KB Created: 2021-09-05 17:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3df928fa25b3bf9674276532c78b06d SHA-1: a25302d109a40f7828ede2a39f8a65df52c66dcd SHA-256: d8d0c3431a48d0eeae5e541ce8d26e0c9dd8b982e1e46ff7c17a09c16e859eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://surtek.biz/image/files/20150209_020111.pdf In PDF document text
    • http://halongbaycruises.org/upload/files/8153744797.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/dabasixolojezaz.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a30fb46b63c7fc46395b8f3f7dc7a6f8/jijadafurixog.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/67710328528.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/zazovitegowunujosuwubunu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e822fa98ecc8d095e040d3911a60a4c/zupoxazowanomuburabupa.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/71ad9378a6bad76e4046b235a708066b/94251595467.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210728045106.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/rubenobavulofo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h3rnjhisf1cvurmmrc0gl4afr5/ponupasezibazugegu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/466e65fbb24e4daca4265f3d9a397654/batededufisapiralizado.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/melezesalixejopopebowe.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/kefimedajedu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609281ffd1a59---76602369515.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/venefefoxire.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/66030048121.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2753676e---60162105364.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a643de1ba3d---pukibokek.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/putabonunezavegebu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f73946eb2161f347e58b24e57f875ec9/suragasuvidipulorupudeg.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210521180912133.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/zetuledinugedirowox.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa32bba284---wewevikatafozop.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/11113914938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=first+aid+training+malaysia+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_off0001f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F03B 18984 bytes
SHA-256: 97238b1a57f47dbc491a03345ed79975986b55728b3b12eb73c2e8317a3ddf08
font_01_sfnt_off000221d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221D0 10680 bytes
SHA-256: 39056c384b25721cd14d53161f053ec01a1343e4391eb9970d13a55a9e67fe50
font_02_sfnt_off00023a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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