Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0493ba9f917eba…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 22:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19543805fa774198405ddb9d9f2ef9fa SHA-1: 366dcb3ed16f284d3332ff6493ec4c44ebb70a97 SHA-256: 9d0493ba9f917ebae834cd22a6d67ca779e571dc9bc8e9f847c5dd598987449d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://kurashi-kyoiku.com/cms/dat/upimg/file/55459481340.pdf In PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/batuxezuvubovuvu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210905_91DE4566AD27C390.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/76352267801.pdfIn PDF document text
    • http://modern-pro.ru/files/file/werazewavar.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/66951291608.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/tesijejadosodoxisowew.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/zujazogezumugam.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_181FBB6525767F0E.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/golubozusimotebe.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/95449922039.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vasepurubon.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/baladizebarolefodovuviga.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/3985061543.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_080B282B02FC9251.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd55010584---xezor.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/49452003901.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/6245584748.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/86075749338.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • http://parateam.cz/file/26399720753.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1f1tblcjcg0s4k1qk1i5i0hv8q/88061251494.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/41182516371.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5275e63522fb400b03f4e9f4f8a0cc8c/kiradowovaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+fire+free+download+in+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/48719169756.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000bb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16840 bytes
SHA-256: 1e7e1cc8806a995b2bcf01e5851978f67eff4f113f39df7f29d85c94338df08d
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10380 bytes
SHA-256: 00e7d140bffe1da55c4a714a54f910ed6def3b04dd791667919cf3b9a08493a8
font_02_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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