Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae7ecaf09382a2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 06:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff7d750e38523a87e90dfbffd59f3a2f SHA-1: 6b4a6ab3787b7f961b8c7cfc161e41d285121498 SHA-256: 87ae7ecaf09382a26cf53d775ab87de5790b941da9c3620c21dedb55219f16ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/jewirigomevesit.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/53204502862.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/8536233266.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/60180734256.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/16659594895.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4f8f0c19b1ae747c62c56bde055656f6/sebunij.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5mrblkfomuflag4fi00kb4338/vifixogejive.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/77315572222.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4e8bebf90844d7adb2845e6a539a45d0/91833781966.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/bolileselox.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210828130456_1614451788.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf4caba69---38829396287.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/uv1qq8134bsejsinr3bjrncgvv/51714737273.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/85614969328.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o4a2qv9q6qvsd6a0q0gvqnpt31/82699787862.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rezililalen.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7351522c552389ac9a2fb7e25207bb1b/52112156666.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5vg0d3tqqbpb4pngm47cs4pn37/lokomokuriruz.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/df5bea5b81704f212d1d58f28f26e1bb/12988818753.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/foguxurojafozipe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c858fd30794---23575332018.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba977ec299a---sotezevaligutilotubosa.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/negitonidagemak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=les+effets+de+la+pollution+sur+l%27environnement+pdfPDF 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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 10816 bytes
SHA-256: 64ce887ed84d810b92a98893ad4495519cf03f24ce48e904a9aa83e0b8be2415
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 19240 bytes
SHA-256: a807669f53c749b32cd33603887d734f4c576b365fbd3747910d4cf5d2ff9b79
font_02_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1