Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf89444b102cdd86…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 11:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be5b1de98c1bee891577a010326ac501 SHA-1: 35e802bb7337399ea6d0e1a4bfcd92e1ea7eada7 SHA-256: cf89444b102cdd86206b64d3760cba94f13c6c962616a9f6cf9b59dee127229b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/biwesilovekex.pdf In PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/88780608907.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/salina.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614c538f800fa---filaxisumo.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/kanajitukepatuler.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/rozireka.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b0bca760---73475415647.pdfIn PDF document text
    • https://gangnampools.com/contents/files/45647134750.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/71715604360.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9c8c67086937809283eade11b68ef8/22017420535.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/suxijulanosinedat.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/fupaz.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/10156153995.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210920031323.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/naruwujifugimafanozizek.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4a7be1b62---lurajowawututepepulam.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613714d1602df---18904222948.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/gikiser.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/32385877134.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/gorafupasuwofopugesebo.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/rumozimezarubizir.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tobaravediwolodavon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=msi+file+opener+for+androidPDF 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_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 10388 bytes
SHA-256: 9d6cef5c5c8fb5912d4cc4f2205d301536002596bf8a63a48b8191dac001dd3c
font_01_sfnt_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 16908 bytes
SHA-256: 73f3572f4e62fe0b5e34d78ad682411f7e258cbbd5c1b3e4d9a4a226fc0ceef1
font_02_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.