Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff645017feec8d6e…

MALICIOUS

PDF

89.9 KB Created: 2021-06-27 10:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9c5e87f9f012f2d25b9c5971414f60fb SHA-1: cefdc605c221086a6ca84e5a3ecc24a58762a6ec SHA-256: ff645017feec8d6eea7f40c2c01f9eaf4365d7d67f910235884455d5bdd79900
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple domains, many of which are hosted on compromised WordPress sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ba95e820439b8402750fc4c0e1939e2c/vowamakix.pdf In PDF document text
    • http://flygarfield.net/userfiles/file/38172367548.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087cae946450---vumasilifajabilu.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/53301192014.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/11414437253.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f9718052---38065028917.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce275481d---77154927038.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/482uqrdtognv0ojig64itldkp0/xirexoxidosutonofovumu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/75b053c35378c5db94ff5375f48a4233/barovikikewosole.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/959c6cb5fc5c37688fd8d2a577c1c293/repiwebebuvanalibibov.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1k34dmdnkfes3g6dck5aaio7ed/31781245827.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lafabimipavarotigotetow.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94dcd3b8d---widazebamuwata.pdfIn PDF document text
    • https://tonitomov.com/picture/file/99610490409.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gofub.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd379bbc2c---lesed.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16247589762042847200.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1d09935758bed28219e894ef87fe04d3/34984492140.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/bidamonakarokulana.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1a1a9a08---mebogokitopopalovu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210627111535.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/9p1lpe8vrl7391oj4pltimfpm4/tusizex.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f8655da78bc2b5f6cca8d7a12459a4fb/64148418902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=introduce+yourself+in+mba+interviewPDF link annotation
    • 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_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 18556 bytes
SHA-256: 3ecde36a128f8bdc95d508a682f01d738dcbbd285f816840681eadda6ff56fa7
font_02_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 11092 bytes
SHA-256: 663b3d3d3a38cf13c86a83da1b70cdcbb9a7c17de7e34185d5ce66fa8a1f8a6e

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