Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f600afa6437100…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8fd770fba04debe10cf81bbab70bcf6 SHA-1: 69af90f39511a92e50dcce81bff2c2c48ea17f74 SHA-256: 42f600afa6437100aad99de8cd814cf301b17dac053ea2aa632562d5ca6da896
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0f858a83b1d27033bf3cedb7cfdf30c2/36787544352.pdf In PDF document text
    • https://aquatrustfina.com/userfiles/file/80595552854.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wikarorozekada.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72f49b3c1---69758745957.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/13037660517.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/kepaturidisovejud.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bc8b0671---54590049685.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/103sojkq0pr96dlk1o3ij71vmg/risigegetirerukop.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9d18f6df---zazugifemo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d0b20653---88498423634.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/safupevasaxegedokamobozi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb6c9f5f9---52675385022.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bililuge.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/41506067554.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd254d2cd7---sugizoguvezategiterobe.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/nirebozufus.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/77963557af615c06087d32beda1342b1/jubixuku.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/22116122950.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zezezokeboma.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ef3c8f5d---nabusuwowowanibaxirokowe.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/kukor.pdfIn PDF document text
    • http://robbes.nl/media/files/kizokam.pdfIn PDF document text
    • http://arslanemlak.com/E/file/61386510896.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/77718622390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dog+house+plans+pdf+freePDF 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_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17744 bytes
SHA-256: 8a19e6685986b8bfa919a40052c9fb04e4ae9f2aea7519a7ee40df334cf27a0e
font_01_sfnt_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15339 10688 bytes
SHA-256: 2a6c8f4e5708598436fd7ef5876931aa772176077b44b3102cc7492b4c14f5f6

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