Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e11ac7d437d76d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 19:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eab8972ea79024d4316782a9daba1f89 SHA-1: 545a86b3eed89f1f112be2802008dfe4ef903f92 SHA-256: 24e11ac7d437d76de7505bbffcb85439e442ff0b48415c806f201e26107532c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting. These elements suggest the PDF's primary function is to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8881

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://catamma.ru/uplcv?utm_term=ppsspp+mobile+games+free+download PDF link annotation
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5cbc14684e0a30416939670af93f2842/topiziwalaniropumasisef.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/11854211278.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/pudat.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/66418815989.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/59581706515.pdfIn PDF document text
    • http://ippon.lv/uploads/File/kavufevet.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210920035333_xc0bgg.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/ruvix.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/xuloxafopiliribebog.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tumivex.pdfIn PDF document text
    • https://mimpishio.com/contents/files/kudegesovaxutufebusova.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/41007541030.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/10451042507.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/94042303677.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zixixuposobomokejakor.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/7987079256.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/guguxebot.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/filamifodedugijapure.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hjjq7enkmibto278jokhs6hq56/75696450080.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/lekukagevupobe.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/81293446563.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fobunujarevosuwotikudobu.pdfIn PDF document text
    • https://brakos.it/file/29051337368.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb592cf1c---kasug.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/78282837623.pdfIn PDF document text
    • 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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 18440 bytes
SHA-256: cea52c9878b6458687b1bbdf078c963c6573f670cf7f1f8277d1415edab78d9d
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10972 bytes
SHA-256: 09fe5c75ebe6c6f3c121325c5a0ff1da35ed384cff3367e7ca29f3fbe53645b2