Malicious PDF — malware analysis report

Static analysis result for SHA-256 56691658cfffdad3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 07:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57cb696e2935bf55cc3b5607548c2c2f SHA-1: 1904b0c729551235338f5cd1a18f0d9620498e03 SHA-256: 56691658cfffdad36b55b3d3de52087e6f01a763e7c4544b2ecb5854df02fdb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised CMS upload directories, suggests a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis and gateway security controls. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=online+protected+pdf+to+excel+converter PDF link annotation
    • https://charterfori.ir/basefile/charterforiir/files/97928748240.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/kawasewukexafemed.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210707_230216.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/44933360673.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c477c42a108---9671529575.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16103af159ba8b---woribomuropopetob.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774b867996f---tobokamiranefokafoj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4071dd261---xudomoveme.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85193c1d69---75004888070.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/komusajaganerep.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/f914891b9322890238cd2a865ad1bfc4/miwipen.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/loneguguxibub.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/584facce8524fd8bbfc09272c7b861e1/19590736488.pdfIn PDF document text
    • http://slsnn.ru/content/file/xugejusa.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/bomisegosegorekud.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/94396421303.pdfIn PDF document text
    • https://aedwea.com/upload/foto/69307023487.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/8962840640.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b60cdbf2---loxaxipitezamiruvem.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/39798646363.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/87133067956.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/41338361865.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/nijijovadusanip.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/85830644402.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_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 10476 bytes
SHA-256: 230c514a33f64e9b21399e7537c481784807a35f25aaf9a5a36c80d1419cea48
font_01_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 17816 bytes
SHA-256: dd1f34c004bbfc53e912da2eeca2792565a7a6ca12aaf4e3653c2d77af364f9e
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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