Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdefd52cd218d3e4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 18:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 026443ec2b2004d2ced7e0a6dc95eac4 SHA-1: 06932348b26268797313718d4c6bf9ab2df1725f SHA-256: cdefd52cd218d3e4fbf3800c3a78cac2b8f58c4fbb3affb04a2474a1c45d9b93
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious and contains heuristics indicating it is a link farm designed for SEO manipulation, pointing to compromised CMS uploads and disposable hosting. The document's content and structure strongly suggest an advance-fee scam, aiming to trick users into clicking malicious links by impersonating legitimate notifications about prizes or deliveries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://inwebjor.ru/uplcv?utm_term=my+android+phone+has+become+very+slow
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/72979002871.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/ramoje.pdf
    • http://misterholidaysanprisco.it/userfiles/files/16875226384.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/66008259840.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336720a6c69---xelopazibom.pdf
    • http://esoftland.com/userfiles/file/89680683951.pdf
    • http://ore-processing.ru/d/files/91344442427.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/912530191.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/tebiwifesofugi.pdf
    • https://redac.ch/upload/muwamubijupuxipax.pdf
    • http://scsytech.com/upload/files/15262897291.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/fipikezudajawive.pdf
    • https://luckysurface.itweald.com/uploads/files/612fe37d02c04.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569dc0cf20---kererunurarowitep.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ffea6a87c91a515938896c167f85454c/nezevetod.pdf
    • http://mamolenasnc.it/userfiles/files/kojukenexavor.pdf
    • http://manegedebuitenwijck.nl/uploads/file/11195191917.pdf
    • http://phantasos.org/userfiles/file/33086622072.pdf
    • http://thepokeluau.com/uploads/files/xofogukedebapulalikafok.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_47_03_6097.pdf
    • https://cochleartudaskozpont.hu/files/ledowigaxo.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/salafevu.pdf
    • http://indianspringhomes.net/userfiles/files/dudaguxalowopegep.pdf
    • https://equipelec.fr/ckfinder/userfiles/files/fujubezowodaruwibabe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e891.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 16792 bytes
font_01_sfnt_off000100a3.bin
6714929bc1e1e0fcdb08eb40a225c5955c43bec0dd0f1fe0950e5c94c6fd0968
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 18224 bytes
font_02_sfnt_off00012fbc.bin
a822b75680af858cdf5def75697d346223f47d9e3dee14d16e8074ec1177688e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 11080 bytes