Malicious PDF — malware analysis report

Static analysis result for SHA-256 965245d273a3f03a…

MALICIOUS

PDF

114.1 KB Created: 2021-10-06 15:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 876384e7ae170bee2ef7418c7cc54051 SHA-1: 6cc67dd0af77e62871220acf93af77f56ca073d8 SHA-256: 965245d273a3f03a43cc789e7df20bca3b95695e62ef78543cdd535bd65ca1a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5094

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://infrive.ru/uplcv?utm_term=build+me+up+buttercup+chords PDF link annotation
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/48095229005.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexijepafimarewukugutak.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/sesonegufizikoxur.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zemur.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210923033336.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/80124119321.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9a4e6db8a---lazadipawunirimotatu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130afe9daef4---konobupanepamimukesik.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/04e23f6b6427bf263545071a23890371/sususawugemob.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/68613832875.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/31921192749.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/likedopi.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109172126337600.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/zaforaleb.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/bogoteginamojod.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161518519b9575---losujikupi.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mebutuvorakafonisiwazul.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/taxeligi.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wutuzufilis.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/38952955732.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/93651435528.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/zepezafidageladenoti.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/vebadotigigarulumaxab.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090823204673499.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_off00017a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A19 21764 bytes
SHA-256: 7f87eea99d0b45e006c611f0b991cf9078d5fa295bb3aa7ef88671f6fafd1f3a
font_01_sfnt_off0001b32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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