Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2db4fd16cdc9c0…

MALICIOUS

PDF

147.1 KB Created: 2021-09-06 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2d58dae0217419118e2939d61ad2c15 SHA-1: 94fb0ae81bd33e0519c6f303b03d079ac9a52573 SHA-256: 2b2db4fd16cdc9c03465165faa7a18fb14bcddb714e6ab19bf49cc7f78224644
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm to distribute further payloads or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5530

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ngusacdon.com/upload/files/bowaraguredozoxivitof.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/92c597d43dfbe920cadf64935175954b/lifix.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d43cb7523---68608282294.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/nafigebukaselozonabatolaj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/32748929982.pdfIn PDF document text
    • https://digireg.se/upload/rijiparegowizevenir.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/39044742420.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vvsu3qrs8lo0efh378a3b8bne2/48032722860.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/26844201492.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/zeduvojuwusoruwosaleja.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/kofewimutimaxuwuvumororaz.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/togekiwotafituxuvutesu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/84094485795.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625420668.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/telamawipuwasozokomas.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/12124446071.pdfIn PDF document text
    • http://firegallery.ru/img/upload/zujuvuxigewiputut.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/bamazejixufepinabur.pdfIn PDF document text
    • http://strandedtattoo.com/file/tikomezudalufobosexabage.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b0424cac9c55cf488182c4775d088ade/68222244536.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/rudizixorelirusa.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e632e819707---21149060642.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73353498411.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612965777bc97---55438928044.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/nebipafovuroganebavogup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=buell+xb9r+service+manual+downloadPDF link annotation
    • 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_off0001eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000206c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206C6 11148 bytes
SHA-256: 16531d93be0f340f87a34b4bb57237ac0c34fd29fc06c10ba518dda9c32ba04e
font_02_sfnt_off000220e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220E9 19848 bytes
SHA-256: 6e043e1086e23f5b81f419b08ab6c0fbf047f307e3b1f1fcae5a9aa6f240643f