Malicious PDF — malware analysis report

Static analysis result for SHA-256 0343279eead3b299…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 23:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 724e93c04d690fbc6e3ab5fd8a95fa72 SHA-1: b563e28bc0f9b2bd0a958945f65e1ab996c083f8 SHA-256: 0343279eead3b29918e055bcacad82953ce7804c4056a427bd6dfb962aad2c4a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous PDF files hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm heuristic indicates an effort to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://majubesar.net/contents/files/1011083118.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/62626707513.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wotimudizenijovede.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902184626_gnypdx.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/43714362882.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613247bf7ee3e---bifowateponenibonod.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/65842109560.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/86745338813.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161334f5b8fdf1---85264085498.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xosomosixe.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/mudojiwuk.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/35502396439.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sizavufu.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/12324375372.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/24622520323.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/29002804688.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/widawitipegajubavogi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7ovk8l7km5knj0ohv65e1n33oq/niwudowu.pdfIn PDF document text
    • https://endobible.com/userfiles/file/33562226770.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nesagov.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/purefoxoj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/78560262634.pdfIn PDF document text
    • http://erdbau-rauch.at/50318595198.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/88854921800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+out+why+my+computer+crashed+windows+10PDF 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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 11304 bytes
SHA-256: 44821650f8eb24cca294aa6192661d67756067890784d95f819a39a5347b11da
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16288 bytes
SHA-256: f07fd2805ddf068b4731c10db8358ca4cc07288cf6d949cf5c4b55339bb187f8