Malicious PDF — malware analysis report

Static analysis result for SHA-256 755cfec23b3445eb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 00:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05235ec5f812c1bde8dd8afc1fa12a2d SHA-1: c84cc4cf511619641b1d163f7a404b32c43a3112 SHA-256: 755cfec23b3445eb6f466be658d187616dd00ca06c99fb8684a9a4ca628cdd62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://chcial.ru/uplcv?utm_term=device+unlock+metropcs+apk PDF link annotation
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sowula.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/velurajebivoxijapamolava.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/13726369410.pdfIn PDF document text
    • https://produse-zilan.ro/files/4398594573.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137014758e54---18857979602.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73644289015.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfb3e18ca---luzupijipajibivuvazupiwim.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bekewowulenol.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/vozepo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312772166751.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/xarek.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50935117777.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/91855595481.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/gisujutuni.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zojomojusesalugotudefage.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d052a7ea6---63259571333.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/bivel.pdfIn PDF document text
    • http://c-amc.com/upload/files/bakopofumu.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/baxanewit.pdfIn PDF document text
    • http://annabarons.lv/files/files/xodikanaxebuxurifomim.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/fadimukabunu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613358003016a---92451678514.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fdc460739---bemibosit.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/19388060121.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/80b45e9c570ec14a4081a846167a544e/78640393223.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/zulumerititos.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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10796 bytes
SHA-256: bdc65e1bf2276b06dbadd12b8d7456760fe646934c58200cba3be46e9202e043
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 17800 bytes
SHA-256: 8630ad4ae33bfb151ead8b9312864858e35500f137b2375d3281760313bc1fd3

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