Malicious PDF — malware analysis report

Static analysis result for SHA-256 2354c700bceda855…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 00:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cba81669306e0b9289072ded2c25e72e SHA-1: 83d453f7c156aa42d1acf6e72b481828febefe8a SHA-256: 2354c700bceda85500d140c76137f2b2d3411b37668ac147448bb436f90bd8b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160760f68a4f92---85455374307.pdf In PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/32506301204.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/nitanoragifo.pdfIn PDF document text
    • http://freeski.hu/freeski/file/zobagesolewurikebutekef.pdfIn PDF document text
    • http://orderkai.com/uploads/files/bezebivimunol.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/62471923481.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/54617008352.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/77004720364.pdfIn PDF document text
    • https://codecs.ro/images/file/77108186881.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/maq7j4j2m6e9fh690m6n9nebm3/tinitigonakokisezunum.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/dekupobaru.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/julikukumeguxafezufi.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/magasosixadozemowixudune.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/90941805275.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/v4gmh1dv0t280j3b53hji27ug5/82904278244.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/madebazameweniribi.pdfIn PDF document text
    • https://marigabung.com/contents//files/99357107544.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/vexokuvulimarigazefeg.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/397e489d46c59eac0daf6366da4b87fc/37120632624.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa825b86d47---laralasipegudosegorelum.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607942e1d862c---88636094138.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/37229225698.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3e754d24b5de83425c835f047f63fcfa/tapanefunuvomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=small+brown+spider+with+short+legsPDF 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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 11140 bytes
SHA-256: 6ebc0d5416725978bad9b4e378457a13282649a72d2eca85187b8cddaa68d522
font_01_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 17544 bytes
SHA-256: b13a0479b2da1b22d46e7655c62c1c128373c844e2af763999f456e30f2a097a
font_02_sfnt_off00014800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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