Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdd92b855a86655…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 07:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9d9e1a2318964e3bd7164c9fc78b254 SHA-1: c8eb68d4f1ec3adeda4df35762110fef53c9c272 SHA-256: 3cdd92b855a86655f88732d9bacc841cf28889a21bac51c9db4f8abd1ec4cfbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketoanantamhcm.com/uploads/files/vajowosanaguvorimaga.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a12265e1---fofikeladori.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/1980412050.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tugefazujuximoz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf1105d93---fumobulazuxofel.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/demiloperozame.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/supikuxumegizebagowep.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/27282614866.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/pavumuvani.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b85055ab---10471492852.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/sugatizosise.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rbvdckpgjn1akeqf7mhgkdv31j/gavexo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zatimodewikaru.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079294ce82d0---61233821203.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc476419d---doravokeduludomowojoj.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e5cec00549bceefe94c330c659382354/22628304894.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dobejunowenol.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/76574622869.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cdd48tfi5ki251rc5np2b4kkm0/34316761055.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/vuwurutijap.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/95787981819.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6a6647619---97678282708.pdfIn PDF document text
    • https://kildevangen.dk/files/45082602841.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4l3gf44nhon26agpt7hb2c5one/56905903322.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160800307b25e6---jakimisaxada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+add+a+friend+discordPDF 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_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 17072 bytes
SHA-256: bacb555eb5688463f935285ab59ce4a3bf89560c7791851ed5adf817a02bd0aa
font_01_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 10500 bytes
SHA-256: a57002dac5ad6df54e6390b59744251ac774f84e860b7783e82a4ff0f677cec3
font_02_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1