Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a4a3ab89cb8fae…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 14:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bff0f32b6b8c261d5404087f160604bd SHA-1: f405acce987ccf71ed81a3f5dab17b3c8a90482d SHA-256: 24a4a3ab89cb8fae31437ea1ae27809bf9519b88a22bec4d9978573b535d94ac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure indicates a malicious document, possibly delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://laborke.ru/uplcv?utm_term=naruto+senki+3+mod PDF link annotation
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remixenakebevuvavine.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/90365380688.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/56668926984.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/64914565901.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/tonadejarimemetijaniduzaz.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908061313840.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/14587164012.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/walulopofosexi.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/27390011240.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///52818345449.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/2819254660.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/72796045451.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/zavimilezizaguwiletovof.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040132431852.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613630f1642f9---8196302269.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bd61b3438bb8c14b62c3cd9ae60681e9/60150133815.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lurak.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/7492592647.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/falezozoguv.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/vowazovuxij.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/duwiwi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8ff304b6a749eadfe2cac39afc20c422/solixesu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/digorazivatufetixofeb.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jojukusifoxo.pdfIn PDF document text
    • http://gekon.net/userfiles/file/64735942907.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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10704 bytes
SHA-256: 13cc9a9554f2dd023e8421457a87e80b858730cc577e50c748bc32eadac90720