Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e664bb1c540e853…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 21:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c039b4b77b2645da4e6ebeab5a349b2 SHA-1: 5679d0752353a16501d4ac64f827bee64c6518f7 SHA-256: 5e664bb1c540e8538a2a1830427c09d4fc009f2c71dfe504a6acba273ee41c9b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs likely serve to distribute malware or facilitate phishing attacks.

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 https://laborke.ru/uplcv?utm_term=how+to+draw+a+lion+realistic PDF link annotation
    • http://blessingsngo.in/userfiles/files/1538574386.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0dfd4b47cace8cb6ca885019d9043fed/78955103209.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/nofajibegodupamu.pdfIn PDF document text
    • http://fotossc.pl/_files/file/rovidekikokevotilalozamef.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16072a115ce17b---26462753716.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/7887786489.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/qlpis4ndfhj812uuvj96n9jjp3/39412427758.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081207b5cf99---gidijapusatokizebiwadozab.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5b3701be0a858b64360cc36423d6c134/80219721438.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fafapetosimos.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/969fc131f19cb159bb550eaa4e043500/27209903160.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c594a23baa6---73668680895.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093477fb8637---gebuwabenesomel.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/kiguzobenivapit.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7e91b07dc12ec06f32f9b710ed28356f/rodaledegajewepeluker.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/zamunokasadon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b865e656e92---jibuk.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c11151d3e59---60625347928.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/66122772760.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/66397371172.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/3354670664.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/mejotukokasuwepoza.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/61324648626.pdfIn PDF document text
    • http://webursitet.org/Files/file/41679549902.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fenelawipoledeviveji.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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 17068 bytes
SHA-256: 33c570ee63272854074a0e481bae99124150d2631fb73c738d7df5f2f8a5a980
font_01_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EB 10440 bytes
SHA-256: 91424c4340bb61ec4925bd359dcc3db4a3daf9724852d30aa85ee19446e5755e