Malicious PDF — malware analysis report

Static analysis result for SHA-256 e779b235b2aef665…

MALICIOUS

PDF

101.1 KB Created: 2021-07-14 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a2e9c25dcb86c639219a9ac9f56233de SHA-1: 7228bc75c905a55dfa6a71a6e779e2711c047cda SHA-256: e779b235b2aef665aeb3ad101566c6051c2063016d88cffa54bc61aea602c47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9899

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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efae0b4076---74444822903.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-13/20210713160439463431.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/zavijizadefadojabikepepo.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/98698984832.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/49658222843.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/defdea5b9ed9b3e276b47a5c86f2c037/xopewanudagolavej.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/iomjkr2m70igsr659m43rnpk77/57457629026.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61526a534---rirukivodan.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082211fe301d---7869345944.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/10934405810.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cda88b594---nogogaxefuxawupupafususi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e960190ba8---xuzulome.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/kigalujitejedifegajisun.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/05m57karsf4rvotcso0dbi32ot/lubivukoxilol.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/dameruf.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jewuxurepalejova.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t2gu5hhmu3tfssstc0vqlnig97/fepiwoxik.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa91c5d23---30762877723.pdfIn PDF document text
    • http://charivne.info/images/file/luvakevopetoratuj.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/pinuzujitilev.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b703342edb---putukofabobebezakaj.pdfIn PDF document text
    • http://arslanemlak.come/file/gufavefajoxisisaxoxumi.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/delifide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=understanding+different+parts+of+speech+forms+the+base+of+learning+grammarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 4412 bytes
SHA-256: 57261aae64114c3d74d25ef9512f77acd7c55b6b0866c0c694717b767c011c2b
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 26208 bytes
SHA-256: 54e07b6d8d73595ced50f00b8f53668fea75b023734e0f18f87f7d60f72576b0
font_02_sfnt_off00015407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15407 11216 bytes
SHA-256: e1051d59ed6e5ca3f5497537d6ada9484477d830f574e8b9fcd30fb2c63e4670
font_03_sfnt_off00016da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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