Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fe90f054cef5d9…

MALICIOUS

PDF

92.2 KB Created: 2021-09-20 11:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fc09ae92867d6727fa88baa1dd85456 SHA-1: 28c552514cab3ffaeaba4b591cad086de2a360a1 SHA-256: e3fe90f054cef5d975d905fa7652570345c9304b5d52edfd6f402fad8806415a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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://medvor.ru/uplcv?utm_term=the+kissing+booth+full+movie+download+with+english+subtitles PDF link annotation
    • http://happyorderfood.com/uploads/files/xoniv.pdfIn PDF document text
    • https://emenu.hu/editor_up/87027785689.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/fawudaxugulodezibag.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161326993b43eb---35764605915.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632121486.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/94303031393.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/92400423447.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/11279912584.pdfIn PDF document text
    • http://c-amc.com/upload/files/84240679671.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/73613260754.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/xizavaxubaxixukufadela.pdfIn PDF document text
    • http://fgosvo.ru/files/files/tegamorizesenutete.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/11690444333.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/mufobebise.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab6886278---natatomeguvuzi.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/bigufisiwuvasogekegewisod.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d3676268---rigoxipur.pdfIn PDF document text
    • http://zeci.nl/im/image/17174133476.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/72208548973.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee79eb882---8741713895.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/nutifuxi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/6821479565.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 11148 bytes
SHA-256: da9b043716988bd5060f37fe0a4c2f1220c043688fcfe2a8c5f6b947e0eb0fd4
font_01_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 19720 bytes
SHA-256: 3782f0b471f802c3968fb76770336bf1bd477f78239dd0f858e6103329f3b108
font_02_sfnt_off00014aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1