Malicious PDF — malware analysis report

Static analysis result for SHA-256 6246be212c995e76…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 02:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77c55c11772f916cc00b934f98d66af0 SHA-1: 38acddf5d81ef059daf121b21ed4814d798c3291 SHA-256: 6246be212c995e767aee6058784d155dff3d2fb875dec0837717de022aa93679
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to exploit kits or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hotelbellevuepalermo.com/userfiles/files/gabaruzenusoxo.pdf In PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/43830616966.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ibtj1rur98mlnndi5erprs2t3o/64997116598.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3cf85d0f407dc1aff5397ea55c062a01/vovip.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tuvuvanoleduzizajifovete.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/74369545971.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/g36c3fd0il323c01cfhp7vpg4f/99072131801.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/10240966859.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/11359442338.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7b84cdd92---seruribud.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/niranixoxu.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/46418880613.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6e5ee45ee7799d267344578ab285fb47/bosigujetaxod.pdfIn PDF document text
    • http://sswjeans.com/files/juromap.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/64497520315.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/69892ae3c238f271c48bf64e6502a5db/32046817211.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/65446443636.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/1131365055.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/tinikaxivopedevizidaxib.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/nizovemibamodigiwemeg.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/36d1690f86b8be8bd7a9bfbc504867fb/51974091756.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/xisik.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/50992950718.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e36fa7545bc9b548f0c09562445653a2/gisafakisunomu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/26635424276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=civic+lxl+2012+manual+ficha+tecnicaPDF 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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10804 bytes
SHA-256: e66e0e4b2c868fca921d6e155d3f55b6b2ef2483b8113ad9fb0eaa94f10f9fa1
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 19296 bytes
SHA-256: ff65f6e8b81c9327b70962c34bea8ae1fc5de93ed692c7128dc24fe3bed7e734
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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