Malicious PDF — malware analysis report

Static analysis result for SHA-256 592339ecf8eecb99…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 06:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d22012eded26864772ac964d916e6e8b SHA-1: 8006ddbfc7bb6718e784a52d310f28bf872636c5 SHA-256: 592339ecf8eecb994a8122d99b00108e222f46c865161be694b2e5456300de8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/3611371569.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9dil5lddqmu3f1r5ple658vud9/porizupojo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7h083dhucbag45vulcq7a57pp7/658101244.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/rezusopat.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/rojufuvika.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c0k60017vhoctii2k3i1pqc1ik/71823761542.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/srq797o9045re82g0ttire11hk/datiwi.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/fanudiluwerabigejifujo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/21f6b091be795209abe5f05ce8efdea1/19778964797.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/10070463113.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i21bchp7bnjom5i5k2me4o29ib/situwu.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/46448845082.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/89575961684.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/75437316603.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/98450428321.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d30a29866e069c62eeb2b0bebc78da79/faxoduf.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/61082534798.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4da1a715d---70229757440.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43927416670.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb41f681---gidowonoxibigon.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/22002636585.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee217283018c111e8c677c14a5e9af9b/xofevebixuwetuwisat.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/46588347087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=inventory+analysis+report+in+sap+tcodePDF 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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10636 bytes
SHA-256: 044423d40862089fc6de067423d9e08f08ee0af71f3b8ebfbff17069216028b4
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16496 bytes
SHA-256: 9b07a26bd9dee6ec49a465601ccaea14ee41b6081df0ab789ce6a5331d03c57e
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1