Malicious PDF — malware analysis report

Static analysis result for SHA-256 761fa6c3d77601ad…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 03:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f9e9bc40cbd9cc96c114f3714670180 SHA-1: 4f22a77796abb85820ac419441151219dd2779ab SHA-256: 761fa6c3d77601ad8eab19d92aebf7fb177b5e1efa1bd1f5cdf23132a968ff80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term=download+photoshop+with+crack' in one URL indicates a lure for pirated software, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bedandbreakfastchia.it/userfiles/file/buwuxafu.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161413ca78d0fe---49604502147.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mezaridebivisap.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/19684144154.pdfIn PDF document text
    • http://katela.net/userData/board/file/86854237128.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/78900820796.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/ruvafokedakoregaluwiteno.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/xuxutuvedogexisogo.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/rogizur.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/19851079426.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/61507414952.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140906be903c---dugatibipamulopuno.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/depidimazekeju.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614562cd8b266---pafusavosobupuzivuz.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/sabukeji.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/93339865000.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/pudanusiwumogi.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/46599695861.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5d0b141f5761fd4c8d548ccd6167f73e/japuwuxeb.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gibomajojenuj.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/juvikemaxalapizelajebiwaw.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/55155795317.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5mckboc6asc3lg5lht3j16sa9b/mikofedexixerolitamolifur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+photoshop+with+crackPDF 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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 10656 bytes
SHA-256: 8b775c2574554062a7e9862a2fa1479ed77d1c92c0b2fcf70c9a3e2a9f9a7aad
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 17588 bytes
SHA-256: 4969434aeb05dffd447776ef463add4eec4361790e47e608c8992f31d0c38956
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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