Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a638d9bfb5617ca…

MALICIOUS

PDF

90.4 KB Created: 2021-09-09 01:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57915e52ef2e17dd23a9eebcf6140419 SHA-1: 1654a54c6c40ec9dd627ea7753de704744c505d1 SHA-256: 5a638d9bfb5617ca9294eab41175d6c6ec510ffc6714a8082d437a36f03dd47f
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and using 'utm_term' parameters suggestive of phishing or scam lures, such as 'gta+v5+obb+download'. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and URL findings point to a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=gta+v5+obb+download PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1fac435---mupugamanewera.pdfIn PDF document text
    • https://expomediainc.com/upload/file/dunorufazutinilu.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/84383790340.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/bibilagume.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a583a3005---rozexuzokowiwopovopos.pdfIn PDF document text
    • http://teplospectr.ru/images/files/2654210820.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135426bba827---19054152770.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377cc8e18b4---14636696165.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5e91e9057ce4617a77227f72f56f22bc/90199783053.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425e758707---kofurobirudevedipoxe.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/11909812275.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/2613321455.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/30445876628.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fonubopurotojazutub.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3e0db65d---wodirigopegab.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/84027068603.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/voduretemajesejozosu.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/37521841663.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/56980323511.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/57853618529.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/fizivubefagilubara.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4ef3263e---rowirejekunames.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/rivulewaliwilomavodetozi.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/dazuxapuji.pdfIn PDF document text
    • http://edeins.com/userfiles/file/63020423520.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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 20492 bytes
SHA-256: 4e01ed8760e38281605080520fe4957fb845b58cf44f8b3574b45a5f8ce24695
font_01_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 10212 bytes
SHA-256: 6a228dfc9e1ed0a26160210794f05c173d96b194bde5bd3a4b2cbf3c35102d8a
font_02_sfnt_off00014398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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