Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99ab783e9afcd45…

MALICIOUS

PDF

71.0 KB Created: 2021-07-10 12:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e503ca3df36f8fbbac32f5b9648d205 SHA-1: 6023ea3b4ebbdf430523ab9add7fa45cbc991e4c SHA-256: b99ab783e9afcd45d2ad0ccdbb66d4ae94e7e02bafbdae2803a776e8c3bb24ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous links to compromised websites and WordPress upload directories, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a visual download button further supports the lure of downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=download+pdf+link+in+html PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/962a007ef55399a450fb5a4671bb735f/60398632954.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/35032489543.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6666acc8b6---1896375901.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g34g1m9f3memkkvgm0cst7nr4v/46735201191.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/kirokijaj.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d02e7fc7c3c69266630816e7729fb365/40441976947.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210625210445.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/74d3bb88ab7a619c3df297e6a0562ccb/wabidenopukav.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ba6kibnuvboqrvvafg0su9soef/vivane.pdfIn PDF document text
    • http://axwelindia.com/uploads/93905675189.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/notemufezobo.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/judunesorukozufopuxawire.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/90388317487.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zosigu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/juwikejavosapilavodomewob.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dc1d4f22b062f7f89f31667cfdec6ba4/vituxaladoxomifijuli.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7c03d9fab---ladipa.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/ruwefirutibozovofeto.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4f1aae4d7fb0457201e1d73efe0c172d/sikusexerigemirub.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/63458134674.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/151e1fc958f017728b0471cab0bc70c7/tamesibefufexawe.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/11345234419.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eefa0e84---43855095554.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/78866455984.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/99492142604.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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 15812 bytes
SHA-256: 94a3a3146ab365b499b5bb80b20f4c124a1175fad75b0e2555b969302c308984
font_01_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10544 bytes
SHA-256: b78baabc0b2b855d684e5f63e7193fd846e9b0d2e762f07e4cd106ff7d81f76d

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