Malicious PDF — malware analysis report

Static analysis result for SHA-256 4592ad1df7253ede…

MALICIOUS

PDF

83.2 KB Created: 2021-07-08 02:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c316270a3cc79f00acf735504b3dc44d SHA-1: 03985ea785aa65254201f5515c046d56792f14c7 SHA-256: 4592ad1df7253edee0aadb326454aed7732d3e8030e90df19cb07c382711d052
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7897

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=interview+questions+and+answers+in+simple+english PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6c1f37ccc55ee74fda92d4f03117655/47662883551.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/30e1e2cd3ff283f2c0afb28885ac20be/xukabogologo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/gizeposimusesux.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/24365620224.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/nijukoromujisakilano.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/tinedesepatokedufoninuji.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/sevinemibukexunugo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jnrh8lun1343i9vk55bgd79ae4/nitolejuginabe.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/lojasajixetumud.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f3004fc8773e5f3ee6c270580810da8d/xujusazatiwurezexi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba32f207c7---63804108714.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2bks84ugs32lj2jin0ks85q811/78870979935.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/walujipepepuwixije.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/deligelowelatejararosato.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/38510053854.pdfIn PDF document text
    • https://carlojans.com/cms/file/boxipazajagasagebe.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5cdgmacaaf2jvt6i10hlesv7ut/jutujis.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/witulonemamipukujusufo.pdfIn PDF document text
    • http://tfforming.ru/d/files/befif.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/gogulajidafujirewojakugo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab72ccd1ab---19894659793.pdfIn PDF document text
    • http://usateatop.com/_upload/files/71176220177.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 17792 bytes
SHA-256: 1a468ba3d8f029da778e3782aea646c5e333c4ff24f4e66d6d3cb11047bffbad