Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ea0f5f197cfc18…

MALICIOUS

PDF

104.2 KB Created: 2021-09-15 18:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 503ed85a6668958c2369b08a5f7395e1 SHA-1: d75686fee0ffbb7c9014311a9ecca2e9f285e098 SHA-256: 58ea0f5f197cfc18f2e3b6272b92405f0a3d1a076c731da2e06fb5615f498398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host or distribute malicious files. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac129b59---jipiserapugixusosadi.pdf In PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luwotelirowadag.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/juxidufexexagazenik.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/volosadajixufolafofufug.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/70155196682.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/worexatofizizeliwuzudab.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae017420d---99278148070.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/tezukubumokifedi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kpa2p6da54mrlgkeejtnlilth4/tonapowinazijivo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/42343782460.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wojef.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/pilow.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0263609a---polikugemunaz.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/61423816583.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/28366432745.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/77487273826.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163e6eecae---ridozejexudotux.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4453f80c71e3640a562d60c774904f2d/wimexovir.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/wilalofewo.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/tuxukipe.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/gimusigelilosudu.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wazovilijowitadutake.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/teruzigimot.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/nefoderekemazozaguvuwoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=index+of+brooklyn+nine+nine+s2PDF 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_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 19320 bytes
SHA-256: bfbd12322613aa471538968dafb71402d98efe247cd1c901d93091d2a54e3ee9
font_01_sfnt_off0001624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1624F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A66 10604 bytes
SHA-256: d1dcde4e67044b473de08301063e62834a3fa7705df21f2a19f69c846d4f41cf

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