Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bac79773c3adb48…

MALICIOUS

PDF

69.8 KB Created: 2021-10-07 09:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7bc2d58bb57ada6c9397f0df36a2385 SHA-1: bfa1c9b89a697a095ef46d8221964151168e47fb SHA-256: 8bac79773c3adb4812f45f78b8046998eb9978886f91c7f8abb5ca8244320f23
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

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://infrive.ru/uplcv?utm_term=inter+text+books+download PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161513e64ec182---leruranuzevosa.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/3961554183.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/79009678529.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/masamo.pdfIn PDF document text
    • http://sjhtractor.com/d/files/dazowanaravog.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/libodatosi.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/wenasupozuravo.pdfIn PDF document text
    • https://upaspor.com/resimler/files/42748777534.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0910/c68c8169524a74f5b2c1de9fba4c2672.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/22737497013.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/1926125253.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kalagenugosivukagupuki.pdfIn PDF document text
    • http://tradotel-riviera.com/file/98516155668.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kegepadepa.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061952004289.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/suneguritol.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b3eda38ce6dbd86a9450487845da28c7/1748863242.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/50362878009.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/xaxixibaw.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161564ddd3aa30---92101529114.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/36830846141.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/masuzoguf.pdfIn PDF document text
    • http://bep-au.theonejsc.com/userfiles/file/85939904248.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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 10520 bytes
SHA-256: 2c70b03c5e72a4fa5b9c39ab7a3c20009076cbd99f2089102402b606f516b25f
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 18680 bytes
SHA-256: 1f62d98cffafc5bc4241f767b8ab4bf660a5b3ef5ea65d13f8c31a4a78fb1c33