Malicious PDF — malware analysis report

Static analysis result for SHA-256 994d858f5f439476…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 12:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0a4cfd227291a7846a12f6463eb6460 SHA-1: 5a4ded80d96ecec3c61586314da4f44cc52c30c7 SHA-256: 994d858f5f4394765b2501a853b9dcdef668eddda38ce9a639a38dd943a7dc4c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=dual+boot+windows+7+windows+10 PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8dd26032e---bovavogureraxezaxoluwepuw.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/72194633665.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109161138069706.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/22371616243.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/99973994826.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/24087851360.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/vebiguwipuxaxexinosat.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/luxanigewiwesalipuki.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/97873653299.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/98258190036.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8acc84ce85b577755c99e9fb431767e4/poradexujuteboku.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a8027133---datebaxukal.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/roseviz.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zenoz.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/99776226403.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/moxunulifozovuve.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152991a08e2a---55983625691.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gefatorunosi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a92517793---17583307385.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/8614988360.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3ba765ab64bf289f299c443c59013ee0/kizabadadazebotigimerexe.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/vikifo.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_off0000afb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 16884 bytes
SHA-256: f4561b28a48d18b92992290a44eb63cc70820a435ec4a081bd3d3c8a80a8c1eb
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10560 bytes
SHA-256: 7b90c52d6ac6ce4281d8554a0632301fef83ee07b40850dfb2807cb899684bd8

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