Malicious PDF — malware analysis report

Static analysis result for SHA-256 479223e2689e5802…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 17:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cff4c9046607d33c7c305d435e3e4ed6 SHA-1: 1f07064b093c22aec8e3ab8dc96f2cd4b4d2182e SHA-256: 479223e2689e580252af594395b5a9cdaebe0416dff9abb0d6524c118dbac51f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, with several heuristics indicating these links point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ww150003.linebot.net/upfile/files/20210910035802.pdf In PDF document text
    • https://nacituran.com/userfiles/file/latew.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/wolaj.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/sanonevi.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/tizuzifoxe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6fd196d9e---37359945785.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/56681378052.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/73598928567.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/fupobemamakoxuxebezemuvu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_1C9490CEA01F85C9.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/56106366100.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/57602644703.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f5f0ec05---bilonogisivuv.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/98600261985.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613857925b6c9---jefilurudujudefavukilod.pdfIn PDF document text
    • http://amrapalispot.com/userfiles/file/zakesowite.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/24120854444.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/sewubekusezuzipomejubu.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/vesej.pdfIn PDF document text
    • https://gencatakan.com/upload/file/pufadodivafokonajezagezi.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/mututizomujuzatekuvux.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/winobuganajaxonozajisanar.pdfIn PDF document text
    • http://rsentco.com/upload/file/pukedogesagirixepojoxazo.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/dabifepekevupuzolujun.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/48959792407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=k+means+clustering+explainedPDF 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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 10932 bytes
SHA-256: 9f22921d81b3631960ffbabc8b6a9a29c90090c5dad593e7d3ede7dcc214170c
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 19820 bytes
SHA-256: 200c3e38040cd84daa31384ac20ee072344a9edeb77a3eac7220f8d88f4ecefc
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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