Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4f9db2bec3a506…

MALICIOUS

PDF

122.4 KB Created: 2021-09-04 21:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8bff0034631c2fb508fbdb524910866 SHA-1: 1ab12c9aa8e5f151a96a44d61fbf763c1337059e SHA-256: 8e4f9db2bec3a5068cb34bb1be427f39010a0d335504915d879172f2da09de34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the presence of external URIs and the 'link farm' heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://irlanc.ru/uplcv?utm_term=cours+etat+de+droit+pdf PDF link annotation
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9d93d832eda48448e49f99c39cc85586/32379792225.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54c4a96d053c7589671b66266aaed913/32082243695.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95e291c18---linamini.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/nuzagavopikodusorixixi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102f1aee6e69---50918871006.pdfIn PDF document text
    • http://gtshotel.it/images/file/91313352215.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/43586470597.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/dorewibirefa.pdfIn PDF document text
    • http://maksimetall.ru/files/58985772136.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65a5bcf354---65689570566.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/bujiririsavexifizofid.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8f40f653953d9887bcd8c7ba68681d4c/zumoda.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcda55e50---lekinitumikapajusiso.pdfIn PDF document text
    • http://www.bandungmesin.com/file/26668776191.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/32530834293.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/gonevaf.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/34809412364.pdfIn PDF document text
    • http://prmakeup.com/Image/files/47992894441.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/19064878284.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610368f99de58---najedeludadejamofolujexob.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/sanukujazagetusuda.pdfIn PDF document text
    • http://vodnik48.ru/content/file/gatutoruz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dbc5e791b7---65139217519.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96fda1724---sopametusexepalex.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_off0001737e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1737E 10472 bytes
SHA-256: 94ecfabf060432f16666444af6b348d011fa05fef513eb98d50efee2722aaed7
font_01_sfnt_off00018b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A389 22652 bytes
SHA-256: b3f9430269334081d3db8e34a7098c96eb4d388d20c75d5514e718fb76293b24

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