Malicious PDF — malware analysis report

Static analysis result for SHA-256 5160de404bc1a5ab…

MALICIOUS

PDF

87.9 KB Created: 2021-07-19 00:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a857973a423f0df8e47c3e2be2b559d3 SHA-1: fdce8319f5717043aea4a8bb60b77e78afc56ed2 SHA-256: 5160de404bc1a5ab74ad4a0d20c2a5bbb768af623968994dfa592dcd3032af09
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely serves to redirect the user to malicious content or initiate a download. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://acrgroup.nl/userfiles/file/32833488068.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/d91o88jmf92nupd2ncl6a5866f/76269873725.pdfIn PDF document text
    • http://waypl.pl/upload/File/bezunuza.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1152d93a1---tokopuz.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/vivepijiratujefogugofud.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/26341e30e904af791ac42cfc74ce06e3/54926682798.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/72404438785.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kl0shs0m6c4us19g9vk4jpa2tf/55706696693.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/pamosegaken.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/92885446390.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/nupubazemuzilut.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/talevaravi.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rp321d3vcsh8cne6npk878u514/98866057832.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0837ee81b8---94086589664.pdfIn PDF document text
    • http://thaide.org/userfiles/file/tedudulizosuju.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/43648133493.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/70b5cec96526767aa5ab6ab0e9fbb4c1/xipuzidozin.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/55488153329.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6qk3juhu10ug0kkhmgffs6ve97/89746672219.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609002d93b55d---xolaguzutomo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7d8174bd---49900348987.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/92459752739.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076657643063---54899066276.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/49ee4391890c9398e1c94e675d5a821e/vonaladijizeri.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/93830731276.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5397f06f2---rivesobajan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=social+responsibility+towards+customersPDF 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 11192 bytes
SHA-256: 2907501d2e2302b2daa2506b33a7cecca371860056f38cc90e7bb73075410453
font_02_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 16968 bytes
SHA-256: 877b9333d4de0445a1607f173c9053f07255cd6b1fc9c4a254fffb1a47b62aac

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