Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5df8d436559f67…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 04:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2df775110296083faafd6d67a954d9d6 SHA-1: 35dffc6296c49a6e9411bc0054a8d7bae25c8640 SHA-256: 7b5df8d436559f67b99f578e9719e345b20da988e3da9ec3beb3f9f4803948c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable hosting domains, indicating a malicious intent to redirect users. Heuristics suggest this is a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mekongtransport.com/upload/userfiles/files/63328996113.pdf In PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/fuzifisetazuvonasetadu.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/wijezijipalanorapal.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/93926502252.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9c396354a6935823cc8dd26f8d1bbe0a/sotipusajuladamoxitiluke.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/garefuserirerewo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/bugikegarigoj.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/rupabit.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/35672665828.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/movimizadijutev.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/vodarajowaf.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/kabix.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/9296291107.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/kofaminazifuxarozim.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad1748180---47227708037.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e748190c3a406a69e06d5dbf3e4ecbff/japuzezomenuzisizalawubuz.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/73958565325.pdfIn PDF document text
    • http://carbontuning.ru/file/58427819233.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/fuxujigib.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/kewoxebuz.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/rojamozofupitaludedepapa.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/28009175630.pdfIn PDF document text
    • http://vpsystem.com/files/fck/72815523934.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vojeleguwuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=oh+my+ghost+mp4PDF 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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 18240 bytes
SHA-256: 0227829fa652d9fee6f2bf9a9242b97af2a917cecb1164f4121f9b1f7960d81c
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 10280 bytes
SHA-256: a840f4b175c9d6571cdfd099d9ccaf83749f1298e4365962f244c1fb1cd4c90a
font_02_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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