Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bb2a82f216fd09…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 12:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9562c09fe11471b0c18323294779d158 SHA-1: c61a058bc9cf6cabb255035b3c4dd8c7c6c0e56c SHA-256: 50bb2a82f216fd09ad759df42c85e609d8218c32a17e2e1e03b38813600556b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, some of which host further PDF files. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely using a lure related to PDF readers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dq1cbuitvua8e9siela4rudat2/sowejigusajuduxanirege.pdf In PDF document text
    • https://5a.ro/ckfinder/userfiles/files/22703633821.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9929e5736---pozave.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/68f2ehn35blpfkskd0l1kq1n76/kufotiwopanepaveko.pdfIn PDF document text
    • http://anpo.vn/upload/files/84588977358.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/86f5a826653ca704a21d49f7e3e48933/29014783455.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/vuresaretadozujisaditij.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9adea243cc---77854911490.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/71685313988.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de3aca2483---67687550212.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0f57fdbed616a4c5d3554528cd50e4b0/8907360748.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0af93ca5b---jemusukur.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nilazuxudewek.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/xatuxavumunatope.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210619221115.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/mobuw.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6ffc4829a---wegameset.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/dotejewizoverufazarukode.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838c20263c---83577701570.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/10191281810.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88181668dd---86424524474.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a95537025---mobafas.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/xamudaridefelasuti.pdfIn PDF document text
    • http://iwishop.hu/file/kiwerubopulewegoselidejem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+reader+2019+pcPDF 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_off0000cf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1F 10448 bytes
SHA-256: 84488ec10692307a288eff59c7bc7ce3aa90059729f0afd811863c556558b545
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 19960 bytes
SHA-256: 3bf543fc0d3e84086065117de16e3d9803a63a1a0d8146a0dc7b8d47f9badda9

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