Malicious PDF — malware analysis report

Static analysis result for SHA-256 408e70c7cd821673…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 23:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46b39b5bf1038d7cbb5eb7ad188f2a7e SHA-1: b7849c4818a406aadca01001e3ad49b94415418e SHA-256: 408e70c7cd82167309a04f790afaf9c07a5d0a9dc178805e791f76dfa01f337b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the presence of multiple external URIs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://5of7edwardstreet.com/assets/media/files/27827368031.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b0b37a53e---38153831949.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/28232470462.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/cb8d5cc0e3a9fc3df4441782beb17c12/zetix.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q92vnj4l1qom4pm4ll01hd4hu0/47951189102.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/subatisunofurarojuxub.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7511aea7---62278137410.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xepebotimex.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3063ee20e---wamijadokenonabagizu.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/ruderosajipudosorivazo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ba6331a0---48019250032.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/585191bdd0b24cacd957e22b0a8cb858/zizawuvir.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/galofupibiruxixegebabebe.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/58378005133.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/jinijakipekitasir.pdfIn PDF document text
    • http://idcla.net/upload/files/46822698075.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/28560251536.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db7c98696---kulesedot.pdfIn PDF document text
    • http://beateromer.com/bilder/file/zoronelefaxuju.pdfIn PDF document text
    • http://royalgroup.at/tmp/96397695281.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/42130673086.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/virilesalonupidizanu.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/topapubipu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/losej.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228946483d---30247768702.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607722f174493---59612797121.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/92837545382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=idioms+and+proverbs+with+meanings+and+sentences+pdfPDF 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_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 17244 bytes
SHA-256: 4f87cc88cc1e6472a5bda10d510746e122a4191f45673b26af66e60b40a87e10
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 11264 bytes
SHA-256: 05d0d4d7172d465e9c18f49caf5bef75009bab0e4141dc6f0f4416a6d5e7c315

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