Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f859824e797895…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 19:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2f62d66d550ea8f14c65b35d9b0365c SHA-1: dc3ecceabe0b105059fc69a6c708bb07994fd580 SHA-256: 62f859824e797895890fa3a086423dcec77edf696531bf636a11c78aca1f4e4d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cancunday.com/travela/img/files/tujipisefuzibo.pdf In PDF document text
    • https://larustt.com/upload/ckfinder/files/koxari.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1a31267f442a4378b074c0b0469979e4/37980372743.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/75802957070.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/nodarobuwajif.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4473a6fd18---65447723061.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/sugefejotiri.pdfIn PDF document text
    • http://exosushi.com/uploads/files/ruvizife.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/fefamebisamirikupe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebdef7bd6b---82863384425.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/17423609099.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/tekares.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/numutaju.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pazaxixemotekazanexibez.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/79119757015.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae347d46e---9372099699.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/41996728079.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tejatudokemuzifijavujod.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7d1f7a753bc49dc8b4fe047b1facc8c/moxofunigikonovetitojuri.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6681fa3d---88103647597.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de27c34fd00---25658509059.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/xunolojugixevojem.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/surinevagasenaxabovunawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=differentiate+between+assembler+and+compilerPDF 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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 17384 bytes
SHA-256: 691d28ef2a18c5be365d6010b4b922529b8482f1c03673dee87624c2649de520
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 11008 bytes
SHA-256: 898e139f315f9bb1ffdbf1decf6d22723a9873b69445ca9d007ad24a050a06cf
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1