Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fce93296afc33eb…

MALICIOUS

PDF

87.2 KB Created: 2021-07-17 13:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a63e2e420a17b6072bcf7eb66e8ac8c9 SHA-1: 3ae6e3d955cc8152078d5acabb49251b114d5580 SHA-256: 5fce93296afc33eb2af3591b71a018d4fa882d081ec0d8f30fbee1ca0334cf80
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of numerous links, including those on compromised CMS uploads, suggests an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31522ce83---65237335848.pdf
    • http://passaicvalleyclassof1957.com/clients/44362/File/31363234929.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sixusut.pdf
    • http://matras-devison.com/upload/file/64905702862.pdf
    • http://tnslib.net/userfiles/files/1247720572.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1cf276915e003f93c8dd2097ed3eab68/2239209332.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c1bbf35e7---26311977808.pdf
    • http://andreaslasnik.com/data/files/33781308873.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/62530e4eb4e2277e5bad198406dc7899/zotukibakivotanovone.pdf
    • https://securitydm.com/slicice/file/puresuzik.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfcf83980---pizeletika.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2vmf9cgah5g502ren4fh15kaj/9494429151.pdf
    • http://msinziniering.com/userfiles/file/revikiwunaforexozebunu.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zokalisuredife.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mlc4tptqa2ueesvh8np9iv4jop/38022561832.pdf
    • https://adreshosting.com/calisma2/files/uploads/xisazitaxexolipak.pdf
    • http://newtarrytowndeli.com/uploads/files/35903705799.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/vetivob.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/7143762784.pdf
    • http://soles2walk.cz/data/file/26661046779.pdf
    • http://dermaktif.com/imgup/file/59615860384.pdf
    • http://cesishotel.lv/res/wysiwyg/file/30537254401.pdf
    • http://belgium-ex.com/images/blog//file/75720866259.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076e8fb07e5e---3963257202.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=macbook+pro+2019+recovery+mode
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3b.bin
8403af9235b997712ea1c8e472ac01bbe6de4cbbb5cff27bb409d3450436c0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 18324 bytes
font_01_sfnt_off00011bf3.bin
e325cee90424e4e6966c09cac1aaefb737c57e6ef7abbe1f94b5933ca841302d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 11032 bytes
font_02_sfnt_off00013596.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 16792 bytes