Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e45ff7d94d88c0d…

MALICIOUS

PDF

85.0 KB Created: 2021-08-24 00:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d64d06e318d5c53989e3fd2d2bfa681 SHA-1: 0a951401c70117b701014acdfb0b107522eb5b31 SHA-256: 5e45ff7d94d88c0d34664ae210b60d7fc33dfad480dd42c79d5c595996bb746b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

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 http://gekon.net/userfiles/file/muporejukidolofax.pdf In PDF document text
    • https://giritrademark.com/content_files/files/44999781628.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/juzuf.pdfIn PDF document text
    • https://themalc.org/files/file/32576398894.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/gazovirosixeg.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/85112981265.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb75531e59---dutobodozomifesi.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/tidazabisivomiture.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/87891382579.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/51a4179d89985fa774bfefe43bb5363d/xapiwalawit.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ufne01f08137hbiubo5sf7u8f3/zerirebiva.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/bufun.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68790c25c9---5989853169.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/93774622026.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/42893627996.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/20010588828.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210709_DF71618539566330.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lgf0mqmpqofet2mme056ktkdl2/4002268305.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/flgjba35ne9405n1pslv596inn/vamegujilifululido.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb201c8a0---wadokirezitisibo.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ma43fp1colfobjaan56l8dpce1/42717479869.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/banopajorida.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/golikoturufoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=shingles+on+stomachPDF 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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 16352 bytes
SHA-256: 389feb6df6f240d8cf956dffe1c0d2b4b21c5aacb4d2b407daded28b086ecfb9
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 10652 bytes
SHA-256: e2a91aba74b2852cf51dd29df35cf3f087957cbea778441e3d2030ad4dbb8de7
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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