Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f17a50e7de22c3…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 20:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b406e5117290f1d0f30b3132a8a40479 SHA-1: 82c76b0af124c3a813e21bc8458292d9e5f0ed90 SHA-256: 80f17a50e7de22c32c49e15c16a71a60406086640288ee0c605f4c043adf9ea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The presence of multiple external URIs and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://pistant.ru/uplcv?utm_term=principles+and+applications+of+radiological+physics+pdf PDF link annotation
    • http://manuale.aziendasulweb.it/userfiles/files/gilixatigetusizokiketapa.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/88101142176.pdfIn PDF document text
    • https://computerzone.pk/file/xapifujufelulozolow.pdfIn PDF document text
    • https://scalping.ir/data/files/file/36437093728.pdfIn PDF document text
    • https://network-italia.it/file/57314254122.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tanabanotimevopokupekan.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/16109468341.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411610b8c0f---14023712107.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/004343d8d0505a848b42cbc22c9c12ec/75185238905.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7cf7c0d8---fifimewexagejebokotedofog.pdfIn PDF document text
    • https://adci.vn/data/upload/file/bubotove.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/buzotisimenoxew.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/pavobikujulorufidewu.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/pajegapetedirixipir.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057a57b866---57163093015.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/87078988649.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/65328525389.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210912204444.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/32331550626.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/84455667800.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/21858955426.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jetuvirirawomikuwuzufusu.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/gesivatunasukak.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/gemolefuluroxugalilazibos.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161435f91d4562---91433439111.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/85614008699.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/farujurogorimiz.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_off0000bbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBF 16060 bytes
SHA-256: bafad35329f4687d02a48ed2fa8237b7df4c0832b2dfe049c9e7a9ed900ee3a9
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 11012 bytes
SHA-256: 3add4d844b7815625816442248f4d3c9b4b9f1014b1ec286fae7735c6e988a5d
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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