Malicious PDF — malware analysis report

Static analysis result for SHA-256 b918aa8e3369d0fc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 03:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 889cc3326d44b2b67db4c8957b7b6edf SHA-1: c7644a45e0d7c3767f1375d247e12fec51107f30 SHA-256: b918aa8e3369d0fc60683de72dc1dbabd9abc14fc1353a32332c72e3e2139f5c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+install+sdk+without+android+studio PDF link annotation
    • https://raselapp.com/userfiles/file/kemubatadojukozazobozunex.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vixatexogepawu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613db57c585c9---13626918964.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bimakipime.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/60000914135.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jibisujirotapobesaxamira.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/fofinuv.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/30734956086.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/pebexevefevujexu.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/68103723866.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/dasomivigas.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161325b9cbffe3---kukoveweba.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/90172033384.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/oo7p8dli8atnri1uvkqakh6ic0/baxobamedovulijudabo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e16b4aeb5---mefujokuxuvafad.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/34653314588.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/jamizavirogidawa.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9b224cb0---42643640937.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xobunibekeviseveno.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/316d2fad9885cb72d710ded34708734a/binoxe.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/redirasoduvixegowawajij.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/jofidogek.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/8063032943.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 10484 bytes
SHA-256: 5033aa323467a35c21b69c73c5b0021163e2dd751cf07032b653c935daab0011

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