Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5d62032752b129…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 12:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81782c1378c1e911f332921ad38e88b6 SHA-1: 5c156fad983eb73fdff6737f9eda05c9279abaf2 SHA-256: eb5d62032752b1293c87ea96f3ae8c8f0de8ea19e309e083bece8432506829fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, likely to distribute further malware or conduct phishing. The presence of multiple links on potentially compromised sites suggests an attempt to obscure the true origin and destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee214645af9---55108225781.pdf In PDF document text
    • http://www.elstar.ru/uploads/files/98365215262.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/51555173206.pdfIn PDF document text
    • http://dsagco.com/Upload/file/24602333227.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/jerot.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/17291538426.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/60563364682.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7rsgb6mjkj28h846nc6kkkbpr2/87015886374.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/54798917016.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/bojiditubawijovuwuwola.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/81247371252.pdfIn PDF document text
    • https://rosycaffe.com/file/10414208424.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62520941994.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/11046152182.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/kujibekuvafevisiraketave.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/dea105b661226f95e12239487c67e52b/guresowexoni.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/67051179756.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95813606735.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/lidozilozewamenitupenoju.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/sadokurokilakuwid.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/nusazotesowisonapitazewez.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af1aafa8e---57730708271.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e588552893d8f7e64e0c875c7e68a98b/rowigepekilap.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vibedesagafu.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/59589984126.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/mofakorevulereromureto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=x-ray+methods+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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10676 bytes
SHA-256: 90eb157cb1226545da1981ff2e8a3fbd467be14d2e0039a3eb8631c08f2a1015
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 16628 bytes
SHA-256: e9b544e9350708a40ad0e88826db1a75895f442458e220ce5165cd863c51e0f3
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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