Malicious PDF — malware analysis report

Static analysis result for SHA-256 5462f204683f5df9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 17:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 391186bbca1f6ebb49ed83c10f7ffef8 SHA-1: 2456d699cf3537a835272b6d35f6121896df57db SHA-256: 5462f204683f5df952c546c8992b532881cb820f85308bda684dfc0ec7bf62df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'utm_term' parameter in one URL indicate an attempt to drive traffic to these sites, likely for malicious purposes. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=windows+10+download+64+bit+with+crack+full+version PDF link annotation
    • http://cgpreceptor.com/ckfinder/userfiles/files/dezemavako.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xifibebefobabebupaboxeta.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/85059481581.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a1ff448d93f2c856302e68b703b117cf/moxojuzekupapeludixa.pdfIn PDF document text
    • http://apothepharma.com/upload/files/wepiloxinolekoso.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/gogekakutaxufuw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0162786998.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/vojutoler.pdfIn PDF document text
    • http://dytac.hk/userfiles/93969366671.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/tisupo.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/73648837796.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136299523b6e---24734885768.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349291522d7---sulewikilumudixekoselupoz.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/66430055910.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/mufuvabikujiviwawuni.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06798690a---lomakapodebabivarapibe.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/61986726428.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161399845357bd---95754409151.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/52492557200.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59294818566.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/jibob.pdfIn PDF document text
    • http://fabtur.ru/upload/files/defen.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/texuwenag.pdfIn PDF document text
    • 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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 11468 bytes
SHA-256: f567df9487cc211bf4908634907c0679c9e598bc85eec9aab3952a27b4a8f5a8
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 17812 bytes
SHA-256: e024da2f9a104329d59e97240971a3f51be486a653cf39108efe594bc6f4627d
font_02_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1