Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68f01a1ccd46b4d…

MALICIOUS

PDF

120.7 KB Created: 2021-06-28 21:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d60803038c09d418cff4a8a6383205d SHA-1: 7dbe7196a404e0617debc76d50a2257d4418b175 SHA-256: e68f01a1ccd46b4d21a1257123b6248c5ffd588ee8805c1abfcf01e4ca708095
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs pointing to compromised WordPress sites and other disposable domains, consistent with a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://oniceh.ru/uplcv?utm_term=mgsv+getting+quiet+back PDF link annotation
    • http://2440027.ru/upload/file/jaletosu.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/najaberifafawajanexalexa.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/susepigezugoxuka.pdfIn PDF document text
    • http://texmet.pl/userimages/file/tupafigilewosimapibejotam.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/kadavibuturegewam.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/koxugajebudonujijakap.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/2021411949.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c972025---ditawubidalugajupen.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/gizoborixukimuk.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bafbc1a48a57abb537c161a21bd10600/3688387876.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c659114471c---96760051558.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/zotulanofi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8llgt90vvvelsofno9h7326js3/53007796550.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/92ca98dc0d57a84dfcdfe55062a2d3a9/80839302820.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/16245204216.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/tagotigizuwobunitisa.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tamodoza.pdfIn PDF document text
    • https://anakmeong.com/contents//files/takerowovaxiburigepa.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/61332060943.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/45042610182.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c1217bf1---47277311748.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a54uaimm3mdste03hj5bfkc8qt/sixagowijok.pdfIn PDF document text
    • http://geodez.com/pliki/file/52425632415.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 10676 bytes
SHA-256: 9d2561b0e5a21a4fb53e968765d80a7477c4b54741ec03aa00a391d692de621d
font_01_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 36456 bytes
SHA-256: 060c04a8b8992a6361a5d85ef3a95c6c1fe9f872a82c6af93d310d8623a94215
font_02_sfnt_off00018e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E20 18012 bytes
SHA-256: ffce9ec86b762c3fbfb4ef063ea1561e897565509d4d523bf8324916f4d4f5fc
font_03_sfnt_off0001bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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