Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c33ffbb98054e7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 21:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9417d317539143a1d1c5554ebb065592 SHA-1: 5472b36fda4b69d5d789577fef451f533be97e96 SHA-256: 82c33ffbb98054e70f7b3ef4a859ee093af75e5d80791353c89bd67952002fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan distribution. The presence of embedded URLs and link farms suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=gboard+keyboard+height PDF link annotation
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65377be77---53093957799.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/faxokepewed.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kijaxo.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905052415.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sewelorudapenegi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0acc95877---nevebe.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/15998057101.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/29825801561.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/91176063890.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/lezadedolukemekefit.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/bazirodav.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5225dd931---15212630546.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/lejopetotabujon.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hdhqnv10q4kvb11lc5molmt0i5/jelenivu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/taxez.pdfIn PDF document text
    • http://mamadona.ru/ckfinder/userfiles/files/jofij.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/jenosabikofi.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/bipefen.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/wesoxilunijuwi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614256e45f758---55029495295.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/buniwisik.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/malowibukaxejolukaxagi.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/xawopox.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/92543821486.pdfIn PDF document text
    • http://safarang.com/basefile/files/89297992029.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914080355223908.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/vawalovutugafijezejudiv.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_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 17832 bytes
SHA-256: 17b89ab3e8055f36a38ac1963c6a3d29cf55dc1b61865ccd3820de709fd7d041
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10592 bytes
SHA-256: d7d135807b63950f24b2454948eabc94d183faa5f4117cfbbd36e535d13c48db

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