Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc47b86ac641459…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 23:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 219cc548ea06c7f6fd7712c4dcb86ea4 SHA-1: 79bfd006c1efcf77998657174f6d7e4e20960228 SHA-256: 6fc47b86ac641459ea798fbcb3c91bac5b65b60e88fb757423d0a4706ed99ca5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various websites. Heuristics indicate this is a link farm on disposable or compromised hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zkmeiqi.com/admin/ckfinder/upfile/files/58495828851.pdf In PDF document text
    • http://futsalcb.cz/picture/vtextu/file/62095507058.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u740ukoie1rfge3pf7m94rte36/xuvijokif.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/wemokejarasisagamepuji.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/61386156837.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wumazizowozisub.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/zudotomurufibojor.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fimapifajiwumebube.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/pejowukas.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/2817511681.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/vusunobenulasabipiw.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/afb7cdb327452e6d7e0d300097f3b3b1/88883743449.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/305b5df372ac25f06351ca155119224b/zujalolidogogaguguku.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/88856711551.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910011944.pdfIn PDF document text
    • https://t2sc.me/userfiles/mefegakukozesum.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/niludawe.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/99185106070.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/15086681238.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308670e9cc1---85778902577.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sukanebiponunifukujo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/21627694358.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/sujorujigijaridokinobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bollywood+movies+online+hd+printPDF 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_off0000c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 17572 bytes
SHA-256: 7f7b3bda0f552ddc2371e980fb57d2ef52c9429650ceaa50c61a8acb1da45adb
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 10816 bytes
SHA-256: 5edb9d57534b0547e2175012e5144c7ef64f27139bbad7dac493a17282c9000a