Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3fc66b4966baae…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 05:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2e5776fea0d1c90cfb2a629789fbc01 SHA-1: c865b64487f8068399403f94fb3979efa8514ca4 SHA-256: 6c3fc66b4966baae410cebbc01e663d5130b36ffbfc0405f73bfe1fb2bbc513f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the presence of multiple external links are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://matrix-corporation.com/upfiles/editor/files/28131321811.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161325cb40c2de---48641605033.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/pidotesawadux.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/16275271600.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/82933865106.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/voxaximapuxipige.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/pidoz.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/52150099158.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/8901345522.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210906_dd057.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cdmq17t9v7644mopfnn7u6vu00/40120934794.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/53677259194.pdfIn PDF document text
    • https://rjpexport.com/files/gegurojadutejasi.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/gigadijixabob.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/sotapabof.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/wovasibotarof.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b600an923nlko3cjbu5auctbd6/folimu.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/mimajatifewilewif.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/vowoxajajod.pdfIn PDF document text
    • http://saint-party.com/media/file/jopoje.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/pimojotikodij.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/rilop.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/18684277530.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/26156634200.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/pobiropozadenilaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=snaptube+application+downloadPDF 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_off0000c099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 17536 bytes
SHA-256: a4b57d293991674a5c5ee47ec5d7f1be6e30e3185d2aed67c014d679ed5d8223
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 10640 bytes
SHA-256: 5aba4380be4351cbcd66f21054fc5ca2ed0a139d7d6e522a758702f6e32c96ea