Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7d9fb32d930ab1…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 09:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4bc990a0c5db56e123b803f8d94b7bf SHA-1: 19857dae0d5f7e6745db43c6e0823e62bf0119ae SHA-256: 1e7d9fb32d930ab15c672116df8e1ded5ba02ca6636ed801a5e536aba581010b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, several of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://smsgurugram.com/miet/assets/files/16752377583.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/49559582803.pdf
    • http://bielle-srl.com/userfiles/files/60029932570.pdf
    • http://indianspringhomes.net/userfiles/files/5807523051.pdf
    • http://njboyuanchem.com/upload/files/86566911073.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/71226485835.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/38294df5c4bffad94b141e883b1e3b09/jugikajevuwuw.pdf
    • http://paneldeconso.com/userfiles/file/6549594200.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15751252885.pdf
    • https://alternativecarrepair.com/userfiles/file/nuxusufidalifudim.pdf
    • https://west-holding.com/userfiles/file/12868696828.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569036c06c---32347370240.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/baxakevirinema.pdf
    • https://girilawfirm.com/content_files/files/tafowunibalit.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/1494522963.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/43014444452.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f94bc1b---52743993938.pdf
    • http://orthopediedelft.eu/files/pedasupajemiponemozebapan.pdf
    • http://matsonconstruction.net/userfiles/file/89452751288.pdf
    • https://kristinanamaste.eu/files/18443936237.pdf
    • https://szabobuszberles.hu/files/files/devupigevupulakusi.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/53811684415.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/10941225623.pdf
    • http://versobrokers.eu/userfiles/files/35973183134.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+prayer+before+dawn+123movies
    • 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_off0000b4e5.bin
2fcde7881d8db1e08efbce02c97fc43eba42650f0f629a3367cd57bee7345f22
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 16916 bytes
font_01_sfnt_off0000e118.bin
8a688cdd7262e5553d21402bf0c0bc8240cbc1ec44f2300d937d362a2c66d31b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 11244 bytes
font_02_sfnt_off0000fb71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16792 bytes