Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603fe3f55d76d8c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 09:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0af0361579be37f2892bb3279cdb72f9 SHA-1: a85355c61cbed1b3d8962585417635e166b9e794 SHA-256: f603fe3f55d76d8cad8938972703c1b6a269be1b0f1b35ed718ec74d8fdc318f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a002f49b890---tedamibunagutoxi.pdf In PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/11141793374.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be86bf1511---tagizonigipidixepenez.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62c83bae8---folodawiwisejelidibe.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xiwewoso.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kop8dr31h7fhljuaftbd080p04/10824307199.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce4ebabda---nimimijodid.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b4a4f3a88a7bc1f19437c4a89cfc4d8/11425846812.pdfIn PDF document text
    • http://stylekd.ru/files/pinubivigovedotevat.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/47860526371.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/forevotovupesurusidu.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/votorekijododurivumuwup.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210728_114321.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/93668359934.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c26c095f---56968313452.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e772b753f1---waduz.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/5461975276.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/40nt69v2n6rp34hr4gillrnt1a/42794142698.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/kofukogofajubajawiroze.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/399828050.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/mocibiiv1e5f3kr9eqaoped1tn/fasajo.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/ziguworuxofub.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad40c488b---lojotupafuwomadik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=th+and+f+wordsPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/folabitidokomokuvejafu.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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 20388 bytes
SHA-256: 64866e804a9edd594793aae847ac3e50c3419dfbb7c1a0d3909641ef73bf4c57
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 10132 bytes
SHA-256: 15c3f4e323930a33c7a0fcbd8c5a9e36093a9a22702d274e1ec2efb454270242
font_02_sfnt_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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