Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d947ed0988d6f7d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 22:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14169d6fafdff28345d570cb5df96e56 SHA-1: 74f20297a82a1f85bc58ccacae23ee31b7a3b5b8 SHA-256: 4d947ed0988d6f7dddeeb5601d8bc97b5c3c9fef7b96dc640022b389792d91a1
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended to lead users to malicious content. The presence of multiple external URIs and link farm heuristics suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://eastmangroupllc.net/ckfinder/userfiles/files/14831772582.pdf In PDF document text
    • http://tutek.eu/userfiles/file/73350667100.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/zukinakudapokozozumikilo.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/32026878940.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/sokeriripisenowola.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2962e5cc4ec3ad34641aeafd8024bbe0/22758772696.pdfIn PDF document text
    • https://clove7.com/userfiles/file/nasan.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143a565b2835---xitukatuberojevolu.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/vepizedewetuva.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tezerukefosapuroniku.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/59820397190.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16143bbfa9a6a3---ponawinobevoripanojarir.pdfIn PDF document text
    • http://mfahk.com/upload/files/folekasare.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/12733355659.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/46483866036.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/natevoraxobazegutofube.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/bebasejale.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/87413833298.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/72194889393.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ce74c59136e04ca3d23efdab593adbd5/44418795970.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sspnbpj188sp5h78lv71cv3t36/rodimuvajek.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d53nc7jcncksn0gendap6educi/viwigugawaw.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/vogagirajemegeron.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/29297054958.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/japefomonefezisof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+sword+thief+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_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 17944 bytes
SHA-256: d6c95fde02dd8ecb46ca4663c120059e84c1c7d9709ad90ade713cbe26152a55
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10332 bytes
SHA-256: 9e95abfe2be35322c488b3fe0f2b3f51115c8bfd099afda73c758c9081df3824

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