Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fa2b62cffff1b1…

MALICIOUS

PDF

94.7 KB Created: 2021-09-10 07:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef659fbb1fa2a0063f8ba340fae89885 SHA-1: 41e72b2d346bdc19b9c0a102669e58c8df1dacf9 SHA-256: 14fa2b62cffff1b14c3a2a95a3d11fb100749720d0467fd85e3d011811bab303
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files, some hosted on compromised WordPress sites, suggesting a lure to download further content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dirpub.org/editor/ckfinder/userfiles/files/bufizovifa.pdf In PDF document text
    • https://callmarkinvestments.com/callmark/files/gogurejafojisomad.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xefuvadivu.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/5017263810.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/fibozuvisore.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fatumeragetifawopupakiboj.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a936664fed---75586121401.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210908153657.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/87935130166.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimezabisomes.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109100558458390.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/61806101946.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/87898460467.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/22531188865.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/12687811553.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbbb12aea---mejonegin.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/34372259.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/mepefiseverelupatupefi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/munifutunebalimojepanuwe.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/990988518.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/38418030917.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613786c8731ed---64530884377.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/garigezopufedojugunuxex.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/30844955716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=turn+blackberry+into+androidPDF 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_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 10604 bytes
SHA-256: 553474f05bfd72b912bf4776ce87f52a60341cacad33c5fd0b6a686de3aba03b
font_01_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1D 18396 bytes
SHA-256: e4a00cf4d3ba781baf4bc11939a7708139c59954dca179a2917b2f4fdf11ca02

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