Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f2ebb428455c15…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 15:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24f550af2f90ac5a29183b7f103c0068 SHA-1: 70bc1581550270a5c5160c07c571be811c3fd47b SHA-256: 97f2ebb428455c153aa16a719bf0616c1d67b20379bbbdc63eaacc144d7d96ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://garglob.ru/uplcv?utm_term=best+free+porn+games+to+play PDF link annotation
    • https://biserica-izvorul-tamaduirii.ro/files/jasez.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/guwomarotiwovomu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/80895420841.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/4383950467.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/16213489654.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/12586917591.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/20357864910.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/rinapepelomew.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/dojawopabibenot.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9c3766f7---51204545706.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/zesafosagaxafedutel.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/85359265527.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/91541574284.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/vidogu.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/55945108789.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/natupekojuvefefovisuged.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/33708137175.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-15/20210915140122626152.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/23a551aa7543caf14fbfa1746e0c3e93/wilagazetuneg.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/netuviwejebegifefidepasa.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/31711671641.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/31294849673.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kd2qo9a5vdap3gcqhb3igbmjqh/buxababaruxupulogur.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/11083354554.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/9803235477.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/xedufeluxirulelorub.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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10776 bytes
SHA-256: 8e8b2a21dd2021bc911fc39265416a2c9965ac02ccc89d2298d09149e439e2aa
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 18108 bytes
SHA-256: 408cfe7cccd20114dc79de81bd6087692d71d77a8d305c91a736087907d4f009
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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