Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c6a08203c90b1b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 17:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4724c5cc06a791b7842094e22f9964f SHA-1: 075d6f2bdf5558db6e165f1dd46ae9f8bc657e71 SHA-256: a7c6a08203c90b1bf41b79bdc79db47af66c488a91bfb8f198270376c6f2277e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF distribution campaigns.

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 https://parklanehotel.asia/userfiles/file/96376612224.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073541e3e946---93876248567.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qkq90mu8m5srtun1257qq7uc1k/bulibeluzofiromojowefi.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/59704668215.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b209eae16---26855869359.pdf
    • https://machinex-machines.com/UserFiles/File/50140285099.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6b13898a6695f0bb2e1f492eaa940547/47037434673.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/kiduj.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fde9553683d5c7ce51362e1352eef97b/teteraruti.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t2n1p84nvjafsb5voocr2l8vsl/99449468512.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d053db9fb14471fd9d66b7331681801b/tumafirawukapiwebebusodug.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7fc0432888a98447a0cd7dfdaa402ea8/59235158684.pdf
    • http://debeleven.net/UserFiles/File/90368477991.pdf
    • http://kripasec.com/userfiles/file/3305779907.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16097ad12685d6---zevozimuputikewojirefa.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/85f1be5f44c0dfb7e04e08a357d21402/xitotunotusejo.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711833cd9ea---reguwir.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/tonurovuzajodixoji.pdf
    • http://apexibd.com/uploads/fck_uploads/file/pedovas.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cee8e05bc999c828d5c0f0930623381e/47324905609.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64ec6b03b9---sewikomupi.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0er0e7k7t13kohtt3mm1ja0ek0/nebesazijilawevu.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3f4cc5b879111f78911c95a15c6ee40a/loleje.pdf
    • http://jfac.kr/ckfinder/userfiles/files/67082786918.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hand+to+mouth+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f179.bin
762f5005222b8bde7bdd686644d38d9fdad48dd40e1d751bcc6b830beac4cbaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 17732 bytes
font_01_sfnt_off00011f35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 16792 bytes
font_02_sfnt_off0001374c.bin
eccf003cf2cc51720a8474b61268aae4fcb21549eeffe3ae541fddeb182b3e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x1374C 10144 bytes