Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae76c95f7b42adb1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 03:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff373ce7929ad5b935dd87c6757105ca SHA-1: 3aad3aae6f7d314292fafe1e99d5ab842e8f5c7e SHA-256: ae76c95f7b42adb19e17a25da2902a3a675edf7b5b32aca310376fb2cb16156c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=download+app+omegle PDF link annotation
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wezubujabiwasijifo.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/22611221786.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/11365277334.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3beadfab00c6088b14f026921d4b82f7/gateferosepet.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/6127726536.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090615103473499.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e825798029---lajixegetu.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/visojutigugexeg.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/13320881325.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7afb13243---42205247888.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zuvimo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/51937050652.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/76376426856.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023d8a3cef---55764519611.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/24546033144.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/c45c82.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fewumimeriwivudutefi.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109010850267205.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/62453499306.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/jowefivafugafasijamij.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/rofufararewobuvosixo.pdfIn PDF document text
    • 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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10364 bytes
SHA-256: a97fd763e07c283ad73f232fce810f2f586e3af8eeba9ec2ce64428a682bb105
font_02_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 17584 bytes
SHA-256: 9a4dd167a44a542c699f2da07235110e727759c0658339aa35c33becb5f473ab