Malicious PDF — malware analysis report

Static analysis result for SHA-256 026fcb50355c7178…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 02:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e34c3cbae2d676a43237549c33e5d2a SHA-1: 565dca710ee284d038ab95ad34e8ba49a5d37e47 SHA-256: 026fcb50355c71782b9a56b03c67a374b79325a8034578168ae6407f890efe50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=free+fire+hack+mod+apk+aimbot PDF link annotation
    • http://come2menorca.com/images/file/90954862833.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/66001344872.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c96af7801042b15b4e763b8b80306893/vajunedepifa.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3554f161---12174875823.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/14591872422.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/89483792852.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/31432465040.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/tewinuvomirejolo.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/43225470610.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/95583502252.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/medenifiragusaripo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366e1c52b9e---nulabifopowovoxesesij.pdfIn PDF document text
    • https://tigapilar.com/upload/files/99828955464.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/dimuzoviw.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/21446889687.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/61435874240.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4ff332d0---70337929390.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/40037898657.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/katasijasamalapekumutipo.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/35619171176.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408c157fee2---79720412331.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/48404981122.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/rewevorupakitimav.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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 10776 bytes
SHA-256: 098fb6e47e5576327d5e4591c655e99393f295d5671fdf38e409933cb72ba19c
font_01_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 17608 bytes
SHA-256: d44689789420d660a36a914e264472c1ec9a5c0864e92a209f1d175d9dfd2a06
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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