Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b43c68191561f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 04:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2fcd0917d43bfe8cd65df50fa27c2160 SHA-1: 3817edb798ea75ccc53517307af7291d9326016e SHA-256: 5c6b43c68191561f681c931339e0a4bf92e7eb56d76b274070f52038014d50ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=ben+10+mouthoff+game+free+download PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52c892e762f17b160345260acbc7a662/gigugade.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/19352127565.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/likaso.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///91411485865.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/boranajerudosewokugamoz.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/8783568862.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333aabc229d---2922291991.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/ranobukajazozobefok.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210917_0109B4FC8BD1ABA1.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631142174833090564.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133998f022f9---45171574510.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/6377456906.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/senikafiz.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210912_9A3065B227814741.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/9253245913.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e08e5bc6c6335bcb4c4e8cde488156e3/91335269575.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/jukinim.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tedelufiwojinofanusevus.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vuditixefome.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/lajusefa.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/93380062036.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/vasovemabu.pdfIn PDF document text
    • http://classtool.info/upload/files/95715178798.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xufonulofoge.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_off0000c152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16488 bytes
SHA-256: 07ee808882452bd9499f3be001573bb5a92ddd5a9621644d685a477b4234e5df
font_02_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10952 bytes
SHA-256: c1f6836cca9b7d4d2bfc974c67f1c6415e9c6a458738b49de045fbc6bf8f5644