Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b149c6a84fd4461…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 08:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 87b4469218ad9910e19a5a42d378f863 SHA-1: bb0e831bd042342f8c2660a7c1b96ac921f79258 SHA-256: 9b149c6a84fd446170db499d4a5fccee0fbe2270ebfd3b0cb5bb8a71991e27b4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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 http://charontrade.hu/data/file/80196801795.pdf In PDF document text
    • https://weddingitaly.jp/images/file/20770011007.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d30260f8---63323300093.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbef91e0da---23781663958.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/83707068775.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/genobur.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e0acbfaf---23122923868.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93d530add---riveki.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/fetitajodekiti.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/zefewupafiwegenato.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/vajipigasekuvepotixo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a741e1241a5---65126044630.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/65786248952.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/78507053302.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3d6065bc49286070ffb7804abea1a029/56229052800.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/rimolaponota.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8db451860cb9091c211fdd025595fb6/64666752636.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/90999818593.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088967261df8---turapovumovode.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15437519687.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875469a841d---46369842900.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/57015399715.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/pemalobazikekaseledonawum.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c6b6c7a17---7647130474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=x+ray+mcq+with+answerPDF link annotation
    • 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_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 10684 bytes
SHA-256: dc03cfcd638fadc9f96027a2d71483ef0f576eb4767d71f4a230051980aecab4
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16244 bytes
SHA-256: d262b8dc919d8914223f39dc5f3cc1a4e22e2ce70fde9c952e9720b56c4481e3