Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9db5927233af258…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 11:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6add647a799bf00443ec5fd321345bae SHA-1: 0e69be0c36ef0459a6ab27506f869c75783ce5eb SHA-256: e9db5927233af258a10c33ab5e6f2fc686b99be3b0b7290a0b963c6a8265d352
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous external links to potentially compromised sites supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4439a55bf---53303219194.pdf In PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/38181421850.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/718447f11163b11ad7d96c285397e955/vuwaputisexorig.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/totebuzirojezokuxef.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/midot.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058c9ca662---fefuwunagagusisulune.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3343a029e---30184979888.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/zobeperakavewof.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/67581525278.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a4d0775c---xilipogedaguzapamubozozo.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/63283318147.pdfIn PDF document text
    • https://aashianarealty.com/file/38840299593.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zunibobuzapolakoxikopox.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b052146e66c---jeparawunefimusixegunolix.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/11112710067.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b2a390d7---58331051373.pdfIn PDF document text
    • https://hsse.cl/files/19748993711.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/54003599202.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/88657682287.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098625523e40---21471058681.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/luriwuminatolemol.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098335d1ee7e---jefosimalutaba.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/35da5a2e53cb443cf648182f05ffc39a/medidobaruzujanowumijaba.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/94041519594.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/25478669808.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09a308c35---55158346024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+check+if+tomcat+is+installed+on+windowsPDF 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_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 18488 bytes
SHA-256: c95fe64bae6782e4234500d577d2260b68890d39359bf79e96a496b3b00128e2
font_02_sfnt_off00012b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 10812 bytes
SHA-256: c9d89f9e3c3e164d141426955f286b11b74dfa68d1ed08b0ee5916f7bc9d6afa

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