Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa55db9ae8d88f6a…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 09:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71fd533a6afba2416835ecab00a55e25 SHA-1: ab7f90714195e5f512aed35d510118912a9bf1d2 SHA-256: fa55db9ae8d88f6a6871fe6bd18d7c53c5bee374c4e341dbe51fe50f3d8cb522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=drift+max+city+mod+apk+hack PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name/files/wuneduxorikelepabajupogim.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/5255310851.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/80000462066.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/75257773351.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/10157920927.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/70018048976.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/31705505154.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/628a310d6sp7t9vm8t6laahlf3/jufuruwezepop.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/zubezojokijiwome.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/2192668897.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210928/file/dovisipa.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/43417230716.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/vutusalesijarulukoxelu.pdfIn PDF document text
    • https://grancom.by/upload/docs/14027378860.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/47208976624.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/bopulavenurefer.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/tuxivavanujazovuseja.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b87c9329a---zodexewifowifamezovokapi.pdfIn PDF document text
    • http://terminsk.by/pics/files/92953603837.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/18305544827.pdfIn PDF document text
    • http://lulanjina.net/upload/files/63922136032.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161513b235f557---85605558761.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/juresume.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/26364344711.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/8838707747.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/bodezitemutaxanasive.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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 10744 bytes
SHA-256: 7c792f0cc23b98fbd889afacbaa69d55f9260b19887d1155978e9fa811d377cb
font_02_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 17180 bytes
SHA-256: babe6f5865d89ba169eed70ba5a83a716d0e2e2801ef531265c012504ad3163d