Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea538307b3b793f…

MALICIOUS

PDF

95.4 KB Created: 2021-09-02 00:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75351131d922df6741b182541adee532 SHA-1: 8d9af1fbaf6a15e3f17b68a98646abf8c612fe17 SHA-256: 5ea538307b3b793f6a51b081ab25177ad00a8617c1e8fd3f0412d0d6a451725e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6c4b2f291d0fcc03a696cc375c7709f1/bamopuwevidukotiwalos.pdf
    • http://ladue69.com/clients/876446/File/47616238798.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab915ba6cbe---duzazapeforusurufimovox.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/724afbda24fe993ceff614af609b8d4c/nijivafufefeki.pdf
    • https://baxsporthorses.nl/userfiles/file/94304058069.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/42684d704d7daf84506dca362b974af9/8100028415.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bb7d209b45751aae49bbac3f720e4791/wizevapediviv.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/2083296723.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5397b27d---75274011828.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4583f48a---norokuzowazulijasezavepi.pdf
    • http://coreaad.com/DreamDataUpload/file/5113122735.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fb6cef0f236f057e844432382cfabb98/80257547901.pdf
    • http://boissee.fr/userfiles/file/nuxaxikufasaruzuwiwo.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/pulejuxe.pdf
    • https://paperland.bg/uploads/file/wafivi.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/deful.pdf
    • http://ejmk.com/ej/upload/files/girolilinu.pdf
    • https://iwanbim.com/userfiles/files/maxofidatowipowaziri.pdf
    • https://hrmconsulting.biz/upload/files/55571290990.pdf
    • http://ediljolli.com/userfiles/files/20339207914.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nemalekipalawijebalik.pdf
    • http://paradisoseminatrici.it/userfiles/files/losepodisumubalixogimotu.pdf
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=michael+beasley+and+kevin+durant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes
font_01_sfnt_off00012609.bin
635fea1fffa79771cb08fece0aa609fcc257ee6f95b639b96b0af35cf7bae176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 18536 bytes
font_02_sfnt_off0001564a.bin
f390dfb69663cdb9747fc3b4a2278ba941a73400968d2e778951881ae0fb897c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1564A 10852 bytes