Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac3024bcfc7195…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 16:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b615253cc86d33b920b469ed34deb60d SHA-1: 078d2eb385174c14b5246fa445cc4c0478e1041e SHA-256: b8ac3024bcfc71959370a177e658d606876b3a190445471819acdd5c38066d4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, many of which appear to be disposable or compromised. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://queure.ru/uplcv?utm_term=how+long+can+chicken+sit+out+before+cooking PDF link annotation
    • https://global-brand.net/userfiles/files/45415154973.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146537c00d69---71841506991.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/novexibimuve.pdfIn PDF document text
    • http://namngonviet.com/user-/files/foripanakipopadulim.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/69603484900.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/39772097208.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/24008082785.pdfIn PDF document text
    • http://thepducphat.com/upload/files/vefepine.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/9307573834.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/79143933494.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/wavewonadudoni.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/45478165064.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kikilojawu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f5b30d8f---mekikexup.pdfIn PDF document text
    • https://theipbuzz.com/images/file/towefulofaraf.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109100955174513.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wopixewewatofomadirubega.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/bumajovumokekatopevozi.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/36795811585.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/49327f406ec6732ccbae041ebd4308cf/11299893101.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/2145578560.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/73448761639.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/siguturadodo.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/daxovubigilawivexewo.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/bemalumiz.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/95952732448.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pcdsn5n261dbuf6iuqpbed62an/futujav.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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 11024 bytes
SHA-256: 1fe0681d0aaf56f91db15e1bef0d7167812e624bad3794e2f33cfd7658771707
font_02_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 15352 bytes
SHA-256: 19259174c83c219d8b1ff930df4dee9bf20abce28a49a0142a4e42741c20f99a

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