Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c6ad360746ffa7…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 01:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d4214834636ff82ec4d0d894872f4d87 SHA-1: c339a00e06c91190fac1f62daa093a3d1d22ed8e SHA-256: 15c6ad360746ffa7b341826a733a4c5d97406432e7f63e813a81b4d905ddbf51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external URLs suggests an attempt to redirect the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://originalcheck.it/public/img_admin/file///zulasenup.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7c3efb0d92ce63c43b7a39b536c8eb76/wesito.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/6d8614e1a7c6f9f29af32c4762cc23f1/79026750472.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vetirorobezedikosepa.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e33cb90c3ab3082b59893cf4bc31da71/zuduregufawotojus.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/55414966259.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/4109492669.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/duvobapatesepul.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/66644979600.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/63574454877.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e704bac1---zorigajiti.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/61063209561.pdfIn PDF document text
    • https://samowar.ch/upload/file/10185108256.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/nugojateveluma.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7r712ii3avln5mponbgpehb2h7/24254433634.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a574ed23b0ac227ce822b12027f85422/37117240961.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc90790c6---nelagozivadalaripuzonim.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ace31e3113d51377a20b2f50c75fb7ec/88560823729.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/785t2plpln08lmjuj0rh8u4uhv/nigoronepenetelefanuzifu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5airtbmbk3mnv9cljrrvkiglm5/68217915434.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/rozagixifezojikegejuf.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609103d5088a5---84576877612.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/rovujuxin.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/86961730395.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef4fc1b620ec739c009ef2e9d8411476/31335646351.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/894982834e166d46e82d4935748deefc/24078799560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=run+apk+on+pc+without+emulatorPDF 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_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 17440 bytes
SHA-256: 8704a22c8c54a8402860fdedc3b3acdf85b2878c2d582656521e82e12155e241
font_01_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 10796 bytes
SHA-256: c4867e5e6dd60ecc7273708dd53b17d073d18ef912e333ddf53ef2bb79e267c2
font_02_sfnt_off00014d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1