Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bd00cebb26f96f…

MALICIOUS

PDF

112.8 KB Created: 2021-06-24 01:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 214940d8ab950eda6ec4a607311da1fc SHA-1: e0656f0bb4cbf4611cd70730e7a4ebab7be3b0e7 SHA-256: c5bd00cebb26f96fd28607755ba30adfcb32688812be9e31387e7c25adbd9059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF 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 compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zamokugrofa.sk/admin/fckeditor/file/gimarele.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/xijabo.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/jugirunanibozetuzebo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nj29ulcjoo6kaj056t8qcu46k2/retijasarajidezabod.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcadc03dc---tinomasumazixeda.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/30713803418.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/zugimuxudigenozaxom.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/8ed578bb5f11fcfcf5b291f0152c6041/metuzudazuvafofu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/32a16ff1962a1f3c1d83685c1a1005fd/57701931746.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2498c28d0f---vewodorufidi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ovmahqap9bspuee22fpuk92903/48656915979.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d200ed5e654---bimuj.pdfIn PDF document text
    • http://patroha.hu/file/sebuxivadepisumop.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb99b999906---66301902292.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23fd283b61---pawotosuripafojatavom.pdfIn PDF document text
    • https://fallsplat.se/file/denogugigulaxavere.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608528feded42---fokuzapiteju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+confessions+of+jean+jacques+rousseau+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C70 5364 bytes
SHA-256: 5b6effc01dee49595036c3b3ec7651790fa68c7a21ad014edb67e45d7dfe40e1
font_01_sfnt_off00018ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAD 11992 bytes
SHA-256: 14cf9727a333160f40c01383e7f5db11df1128c6e1779635eac20a844f8c3a41