Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4142e6b4a1f69a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 15:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2742269a5a8c013115de5a5e8eeb9708 SHA-1: 2e6b4650c19e8b27140a99fa1a399975024066b8 SHA-256: ae4142e6b4a1f69aa54939a832245af5c271cf8faa1f1c431f382d59b16d8b92
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://digicpictures.com/downloads/60069946889.pdf In PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9172272334.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/retib.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/lidikabisi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/21692176059.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210911_F5193DE2BFBD6959.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/bezumagedogowusurudebewu.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vuwikisogogogam.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/jewajebi.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/guxivapanovokapubowar.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/kekived.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/72198082601.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/zipoxalewepepakolivosur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qhe507r20nq679riqfb6dg19l3/46521374245.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kogofosujitibe.pdfIn PDF document text
    • http://yuhongzg.com/d/files/43207049102.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/vudafasufozizipogafufaz.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/novulevu.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/9931677555.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/39270607696.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161327d484d160---18389998752.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/77987299780.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/liderise.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/zusokin.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090511333914.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f5e3d86b621ff38032363147971d8315/rilulaxun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=expo+react+native+build+apkPDF 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_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 18676 bytes
SHA-256: d5efc52f6d5c25cece86cf4fa9aa770f21f5f9fba33a4e87f07d6e05ef96ac29
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 10820 bytes
SHA-256: 4fc539729cb9bd460cc8d9ab8b67d0a29423fbb3bdc9169c564134d7769c0de4