Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b753156335742a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 10:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72914999d126ca457beb78bc72df5286 SHA-1: ddc8bb4dd2a90fbf40c476bf8aab7ba4127cbc03 SHA-256: b3b753156335742a72e1d543b734795b0c40352a56db9a298500a6a477c7c22c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The embedded JavaScript stream, combined with the link farm structure, suggests an intent to redirect users to malicious sites for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=parallax+apk+pro PDF link annotation
    • https://abisspaandboutique.com/nbloom/fckuploads/file/mupipafanifuzoxulodowuma.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e86f87c---xabarutiwilizimonelis.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/71204149984.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/dudalatuzobesapokat.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/10787945235.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210906051336.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/ripogiguluviru.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237bac574c---jibetud.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/fofisukojuzo.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/tejunefizanidulumokilowa.pdfIn PDF document text
    • http://client.diffuse.info/files/bobazapakexatitu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369add5d420---61149932386.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a910046d70---13682578073.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zijidotobojudomotuk.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/50592183316.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///tarenobevoriz.pdfIn PDF document text
    • https://breedlife.com/upload/files/potaxorijidexevuvixe.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/27403929424.pdfIn PDF document text
    • http://altus.pl/userfiles/file/gonuxipisanesubavibozapud.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133dadd4dff2---pijumukazelidomixabo.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/90786804345.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/dokisowilezo.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/47875377207.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l8ojc23hq034i5h95ee9atsk26/fopifiguku.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/5574445823.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/wifiganotekun.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_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 9848 bytes
SHA-256: 3169ca29560839e28f2ef718ff0ed02e7db5660ed0147732dcdb41ccf65523e3
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 17564 bytes
SHA-256: fbb1fd6dcbc3fe5cba5ad8e0c47e61f132ed64b79f5afae1a9fd442bd64f59f1

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