Malicious PDF — malware analysis report

Static analysis result for SHA-256 8601ee2d5d08dffd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 10:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e63987d47b4f40146ebc4a9b81735245 SHA-1: 921be68d2053fe5e895212fed6e711b6138d5924 SHA-256: 8601ee2d5d08dffde1a71f28fa907f7c0f043ee4609ceca24911f78aebe89295
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=bible+coloring+sheets+pdf PDF link annotation
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773065341bc---tugumawakixojobejozuk.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd18ee0b0---93176777162.pdfIn PDF document text
    • https://le27.fr/docs/file/78427665461.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rhb6er8qis14554b4sorjc5792/34584397564.pdfIn PDF document text
    • https://egca.fr/userfiles/file/19397064159.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/g5o3smao1rjqk6496uj0e117h9/rojadarapavuxew.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/jovobefixivovigomum.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10c2b7a27---85224184069.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/39755469043.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/wuwonowozulepojezogi.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///35445887909.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qc1mou14n9pbo6tju573if0r4n/32196398750.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cb089249cd7---seritedekojo.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/31399061213.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31065217724.pdfIn PDF document text
    • https://onlinendttraining.com/files/63488840514.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dumibox.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6805e471---nopobufokizidegajuku.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/39120819793.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/37934858749.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/madanageramejowopolif.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/94829677251.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 17112 bytes
SHA-256: 7c653226491f7bedc4e4febea5f8e61686579e51ef8397396cff1dc8564cce9f
font_01_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 10932 bytes
SHA-256: 3803c5059b46f67b606519714a914bb5c6341c2df4db77793eeeb8d87787ce4a
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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