Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e1703cdd26700…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 18:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5388179cad4a9b460693d1a78a860495 SHA-1: 47abd66e261d68ec531cb16198268ac19de0888d SHA-256: d37e1703cdd26700b0f82d2b5d3b7a87dec20fcebd71fbd2a3060216d0704d6b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into clicking malicious links. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bhs1966maui.com/clients/64750/File/juxofuj.pdf In PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zuvorokotuwexa.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/lumidawa.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/nuzedogaxapezawixuluze.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/borarixapabanul.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/29146937687.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210621143748.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/83014031825.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/090e05c3622824b5a99711ccb058483b/40022167539.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/jshdo6oeigkoftmniq12pkb9f1/vakipujiv.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa36eeea00c---34831563558.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/41593672593.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/30852619558.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/22216856474.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/genakafijatosebivigerojip.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/tibeke.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/d90mo8dqm0skj5q053j70ig3nv/50278501953.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/josesiju.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825457b8b80---94825444146.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/xagakibuneteba.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070fda261296---59971551989.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/kepokodekijuwiw.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/34793412214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=loratadina+1mg%2Fml+bula+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ab4495d5be30db8fef9a1818e2f0bce/12890390060.pdfIn PDF document text
    • 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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10824 bytes
SHA-256: c781ad2477ef1c41c7082a4c45f87ec97c07d15a99bb3ddffd90cca10d63f1b6
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 19684 bytes
SHA-256: b27df6ea190a27819d0735c799ef876f38ddcafd570378aff41693913057043d

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