Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e4a70f141d2268…

MALICIOUS

PDF

100.6 KB Created: 2021-09-13 02:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 423bfc51929e72d0371dfe5db558ceaa SHA-1: 0caf76e7caf085c87f1572488d2ac129bc3c20cf SHA-256: 04e4a70f141d22682a60263f003f6e04c88543dafdb6c162450748b38887cdbd
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 CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents as bait for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2f10bf9a---jozudowidakufi.pdf In PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/mozeju.pdfIn PDF document text
    • https://bak.vn/upload/files/weligazurufisumovepedodaw.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/19072988711.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/goxerisilida.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/14737257629.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nowofevijudipalaluni.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/ligafo.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kemokimutoribepiliz.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/13646079570.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109042359382528.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mevupimulawatuwawor.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/timikejojakimo.pdfIn PDF document text
    • https://datenglagi.com/contents/files/67998307832.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/97614382115.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7da0411c3---narusiziduwo.pdfIn PDF document text
    • https://medpressa.ru/files/file/3857512189.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/62947152232.pdfIn PDF document text
    • http://viettruss.com/upload/file/kisaxowakitafapobeled.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/tozefekigitebum.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/5387461921.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jesew.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/mufewesukaxokarapi.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/memusufafojilofubudikema.pdfIn PDF document text
    • http://saydersan.com/firma/files/sokunetefixapexo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cfad541c---zazalalag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=moonlight+lite+mahjong+androidPDF 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_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 18948 bytes
SHA-256: 29720eb45a8d87ef7851c3dc432a37a55920c38cf17615a19b5b41aebc9475cf
font_02_sfnt_off00016b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B92 10652 bytes
SHA-256: 2c30335a8636fa0bb629a5d4d56f78ca0a4c76ba011ffb985d65d17531bea355

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