Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c21068c391d954…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 19:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b2cd97cd10fb89f9285a07bd7d3dcda SHA-1: 461159792ee6375dd7254db0e02824292e7cf5d1 SHA-256: a7c21068c391d9543c74260a9b019be3863958c84eb53e58566c5d6017f9078b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable hosting, suggesting a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://gtnet-engine.com/ckfinder/userfiles/files/53863385496.pdf In PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/xumesegipilesivojopofo.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/44394555018.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/19796632503.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/bovuzuwigajepajivulozo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5a806b5740cc12c9452268a6cdc2ba/50484668220.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/wodurepaxalava.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8ba9a3cd6ef6627e897f519c56d04292/kosafirivapilotakorizeze.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15f92f0a---dojasi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161424c85d02bc---24214331354.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/sowexaj.pdfIn PDF document text
    • http://gibisch.org/files/files/35949297339.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55781bb39---basajufituturuzixigevel.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jixelejixan.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/68839279265.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/vezimudeniwuxinu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gaverunur.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/fixirejegovilemolebiti.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fa8b6880---52250083074.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dibimorufi.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/90325331388.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/57978668755.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/19267733715.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/wanowodufuwogivulewagosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=snaptube+new+version+4.88+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_off0000c382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 11204 bytes
SHA-256: fb30469c5964b71b035d915ca26965b0fece8aeb6a27a25f9c01384c3b48b38d
font_01_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 18020 bytes
SHA-256: 458399fe45d008d7c9ea63933d34842f051b18a287a84332bbc12255fd81f05a
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1