Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba8ac96e8072e48…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 21:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 441d96d61df3f00f8ba3e60279bf8691 SHA-1: 64eb4dcd3993bbb834652675500edf6bf783e12e SHA-256: fba8ac96e8072e485f5eb0c8417acb814d8035397e237d9bde29ae4b796a776d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV. It functions as a link farm, containing numerous links to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://malashealthcare.com/userfiles/files/weluvojidomoditupuje.pdf In PDF document text
    • http://www.bongbansaigon.com/uploads/files/34907578806.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musakejufibinitakizosoji.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vinesugeviruvibitubuzuge.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/soruwokezepuli.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/20696192531.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dfd85c1b---nowakabefarulalogidapib.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3106fc608fe336eeabff488ab6c90d8c/zozefiloxorezeximogum.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f2a1c3beeb3819672038708b53fbfcbd/41079970038.pdfIn PDF document text
    • https://parfumzone.ro/files/file/1536926814.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b5f8e64c4---kitikipilivopoderiliwij.pdfIn PDF document text
    • https://pecintajp.com/contents/files/lemubamokatobubisa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da86af2f13---99914266548.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910065355.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fd06741a4---29219444252.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/wositogobowe.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/lifeguvoginozapesomabo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rhrnp88144chg689ddpnc1fed3/45191376924.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/75930894227.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/2630103382.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/basexafakinosapi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429ccda916---30498093516.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161433c3c3f7bb---36632699012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ubuntu+rst+dual+bootPDF 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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 19152 bytes
SHA-256: 3ca1d501926aac8bf2a9ce2f43d5932b04bbc0b0d15488c907f2b1e0b737029e
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 10264 bytes
SHA-256: 5cf42524fa3c04b0094b9c3f0de8cf82ca41c80cb1417e9d36a68df0b8dd4b6c