Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af9b4652b1a4823…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 52c75d903ec0d3a947d9eb4664c4d8a0 SHA-1: 301351542114c44fd196d1f949742a67f81c4f6c SHA-256: 6af9b4652b1a4823db3c4bb73c64229b13af60413dfa8bb02ff773631d70d20d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or link farm attack. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=forgot+exchange+password+on+iphone PDF link annotation
    • http://jowinbio.com/upload/files/202109141753032788.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c93937a74c---96618777171.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308894572535.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/larovawefokugawibumo.pdfIn PDF document text
    • https://partetesal.ir/data/file/ninodejuzixasa.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/53516055668.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413d7ba9eec---47661512881.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/bonipiforifibux.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/18121270872.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/42907961101.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7579c563---86363751655.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/62074086602.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/vegeleniwegile.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/zaletewumowavopuvonepod.pdfIn PDF document text
    • http://wdnederland.nl/file/61826886999.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/18207870179.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/02/sumezaziraganu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa6ea78d4---52342280220.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/zafamoji.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/t1lve5ccue99qcab7bdtnq9h4g/zopulikosadixisudafepew.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/zoxud.pdfIn PDF document text
    • http://potlista.com/file/files/risokax.pdfIn PDF document text
    • http://ccshecea.org/upload/files/surez.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/34506620370.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_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 17808 bytes
SHA-256: 876510e022322f96b1aa73922a24cbcf215a80f1f9150dd006f9cc8e5371e98f
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 10912 bytes
SHA-256: ea577a8c31e2068eaf1c4cfe5c8b1f39349daa053cda97feef8ccde930763c47
font_02_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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