Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d499ac4bc3f1143…

MALICIOUS

PDF

76.6 KB Created: 2021-08-18 13:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c3e089de975813dcf52385b503c775c SHA-1: 662055ed9ac9c509b6b258e54d6785e5e82d9cbf SHA-256: 4d499ac4bc3f114379669af15761dace8f71bedef94e9c9bb6df572e5fe73275
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://eviljoy.com/UserFiles/File/21911765762.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///38850310017.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ln4hf3vf711b15gl2gata5f4ch/23157173476.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/97548681176.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/36536976709.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607924a2d76e1---zufejuxugaroderemujosat.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/59344833002.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/39204013203.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tibasixo.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/15323415982.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/situvesaziruwugonor.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0afce47ca---wibakowefi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1152a28982---20584916897.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/jonalogugetevupa.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kevimidumenogupinapol.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e17ed5e7---wenuxemudi.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/chqa62n145fcseodpaer4athos/jefefawuxobakaxe.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074848b05f3d---xupegaralusatu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nonapopekevosafali.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21472f396---zuketemum.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/19f03aaa86ab1818f3879d4db7e493be/57091838314.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/73avtlkq5vnai6eep3rjv0ijhk/tefirejikuloku.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/g3f3mjvfitt1054c6fqvosluvp/golirusozanamaroxurat.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/simazitifoxurudarexuse.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/73c9d3e433d7f92fa1164f95ffb7893d/xujadefopixukifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apex+learning+algebra+2+semester+2+answersPDF 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_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 10904 bytes
SHA-256: 29fde5a154cf16e0009876310ad75c00ef663ddfae1b93064828662db12600bd
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 16832 bytes
SHA-256: 3c2a73797789c160d6dcc202b7a8183ea748bcb2d5b3aa3d495d0e941374b1d2
font_02_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1