Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e18ceaa18a2e5b…

MALICIOUS

PDF

105.5 KB Created: 2021-09-06 18:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd5ae9b38f51908a4b512af35b2c7284 SHA-1: b8d9c3d250896059adfbe657c2d13bf415f3f5c0 SHA-256: 56e18ceaa18a2e5b21f188bc911c0557f25a8cb7cbfb2fa89cc8a01444dfdb4c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ledson.ru/upload_picture/nemewodobulis.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/todixitokasojatina.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/14602876182.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/42291256708.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/28368712873.pdfIn PDF document text
    • https://emprenderem.cl/files/jukatisokap.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc382dc8dd---51590833415.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/45401484211.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jajafatodabelodedibebesar.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/48033994692.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/69rci505fag54j7mm93msnn7h5/tajisefix.pdfIn PDF document text
    • https://jagominum.com/contents//files/miwosozafugeno.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/86047396002.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/6082957455.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a55b88d4acf8cd236809723a5c639762/sijupakitena.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/rufitumegedunezagexu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609902dea64ac---13932285477.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168560aa049---xilizuliv.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2db2914b---kagumoxajapizo.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/32772249110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=r%C3%A9duire+taille+pdf+macbookPDF 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_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 11040 bytes
SHA-256: ced23cfde4f069c258058b7225047b6f530dfb5624d6a45a5671e1cd6417625b
font_01_sfnt_off00014867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14867 21652 bytes
SHA-256: a3feb555fa04f3f3dc59725c5726b01d271f43e8c3805413d245f4884add15d4
font_02_sfnt_off00017e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1