Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f0fed1d5d9d363…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 01:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 833975d4190c86d798e2641d820d5fb5 SHA-1: 0d7f6742f8d93604ea23eb11d33ea22321f237b8 SHA-256: 98f0fed1d5d9d363f82024a996a738c4de9a4bd3708084608fe92e62f8abb62a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised websites or disposable domains. This pattern is commonly used for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://adikkeempat.com/contents/files/78543373206.pdf In PDF document text
    • http://siamsankyo.com/Uploads/file/lipiwaseko.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/5662451840.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/27024913193.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/34119210414.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/puxixivujamogunig.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef470b08df---ginusiga.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/72725651453.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed40e634e2---93700432713.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/sitiri.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161343eadc4610---mezojukaxikateli.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/48913614537.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/22660694927.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136069ab1c4d---45598680656.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/98169641298.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wunitaxorupuwulafokafux.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/loweb.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/tobanifuzafokizazinufegu.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/nobeludamanepojed.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/famogokafixasizarofowarup.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409981a1413---mavejogoxaxibikuliro.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/lugapuxekevugeji.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/28846244026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=impossible+quiz+57PDF 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_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 19004 bytes
SHA-256: 8f6cd296cbc1e8afb9e4a543323bf65e5d3d3757816d900495f5876c08d544ad
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10532 bytes
SHA-256: 6a49a8367787f35db734793b05b415900ee35dc924fca455999c221ff2eead52
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1