Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd66e710b29505…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 01:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c518757b09fc5b73e87f7caa69d916bd SHA-1: 820f7b6c7449044d5df82f6d3601c7a50d602d4a SHA-256: 6bdd66e710b295052e4714ede4c52b06a144c4e32cbff25984e70f3efdcc50f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=historia+y+sistemas+de+la+psicologia+james+brennan+pdf PDF link annotation
    • http://isotope3.pm-ural.com/uploads/files/60492151047.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a0506e431c43e2cabafaaa995733e77f/3996406958.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918022946_83ficn.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/51228704243.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161442bc3ceaad---30511483319.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/52944137696.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d2fe551c---tulamamipuw.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/32953756748.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/32068008275.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nefajagurobiworevevor.pdfIn PDF document text
    • http://swhos.com/upload/files/55614352845.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135704eead8f---nizumudekusivita.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/83431007689.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/rimezulakapu.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/26140116756.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1250481qo0le5eeqb1a7cb17k2/welitogobalagixofevu.pdfIn PDF document text
    • http://inprovitvenezuela.com/ckfinder/userfiles/files/19239393079.pdfIn PDF document text
    • https://pepsima.biz/files/file/kawidadeka.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tazedovomopefitakerowa.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/bekewulifegor.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/porivateroz.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/30601599477.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/silopegexiv.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/lolebutugijezokobilo.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/xipatevisizonebuleto.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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 17428 bytes
SHA-256: a7660d7fd9902615b85779c0daea9d93d16bc2b8e158a11230de8f69f04576d9
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 11336 bytes
SHA-256: e971114d7902fe1ff728ee6b89976c0fd0681789c5c1d70bc476392b4f63a7d5

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