Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cb1e61e3dac22a…

MALICIOUS

PDF

79.3 KB Created: 2021-07-24 23:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e71aa894a69588de14f7e3d92fbb822 SHA-1: 383a0a2422bcbf5a3f2849167870ce40a1b92f0a SHA-256: d9cb1e61e3dac22a2915ce3bedf81b0071109429117253b1030502eb681ae8fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains a link farm pointing to numerous URLs hosted on compromised CMS upload directories and disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://abugfreemind.com/userfiles/file/vupabagito.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1483b26fa7---sowamelotaguxiwatudatis.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a027db3b349---86079109955.pdf
    • http://wsm.hk/images/uploadfiles/file/bufapefurulefenakevizin.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/4413044c76393c38c36ec8e6fcfa5ccf/54686816609.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609890516a68d---43520726779.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a206afddf3f---28444576347.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607004635e439---18368594752.pdf
    • http://flynewsletter.com/uploads/file/lozivuxoxawomika.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160755045f0072---vukolufebexuzexa.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v7i8vsk28ulndlq9l0e22ghpd3/bebibebirikojudeze.pdf
    • http://eot.mn/uploads/userfiles/files/97050338972.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/glliq0hngljdr7i7ddsehv02s1/51177628843.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/33486172233.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073641f7cafe---metoxufapiwopuwivebiza.pdf
    • https://blindnow.com/userfiles/file/71404764815.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1dbb48e7---87092477996.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbfcab66ff6---45441272040.pdf
    • https://hgb.se/filer/file/jujivirelibenugetaxiw.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fe4b4a6f7455109e83c5fb2bbcb6d7fe/didifujezonin.pdf
    • http://keralajesuits.org/userfiles/file/61300184806.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160776c396b1a8---fajavesuwogojegobi.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/zawugikewusev.pdf
    • http://automsystem.com/UploadFile/file/20210504134747660.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6d829e753ba745571e2e892924f643a2/jiwojofuwememodo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=descartes+meditations+on+first+philosophy+hackett+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_off0000d1df.bin
f14f6d34f36277b5bd26f4479ca9378b77ee92cc82d0c8e49b6da56be4b95ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 11092 bytes
font_01_sfnt_off0000eb98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16792 bytes
font_02_sfnt_off000103aa.bin
16e0caff44e7192d8f02b43bcad0fe3783034fe4e32b620f2266d6df4bd339d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16468 bytes

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