Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebd5771b5854e90…

MALICIOUS

PDF

83.4 KB Created: 2021-08-19 17:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9410ee7ec3a3b4c5ee078825b57fdc8b SHA-1: b07ba4fb40cdbf6081cb996d06fe35703bfc081d SHA-256: 9ebd5771b5854e900632ae54085a976cf0884018078b6ad9ed7b47935d1b7cba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious files, suggesting a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://theonejsc.com/userfiles/file/25239363418.pdf In PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcce7c4772---gezivowosisurav.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/96507325343.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/25673931463.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5b2mn28thdq1e7rjve44vt8jn6/gemogavulesejowunodu.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/milizuxomixeziwus.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ffbc4c7b---27041509329.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/vakerev.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kisotedidijovevaserek.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/93756cb7e26a1279ad36d6f397cd7203/82144066131.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e05faa7bd436c0bab1ed6337b860b2e/vubenase.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b422638a3---susigedolosazif.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vo5hpiu8l4pbhefa79s1sjh2j1/61759079708.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/43393918796.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/35208602738.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/56227876741.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/dudera.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c374d8589d9---mikotoxonetutalemijezu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607925ff1d987---18329660071.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/82927c8a93919a52b24d0979dbecd48e/xepumajorug.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/59f104261b4b17de853aa377d9111895/52900652111.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/092336097110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rabbit+tv+usb+how+to+usePDF 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_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 17952 bytes
SHA-256: 6069bc6e671db9356b211fbb97f18fc9088f46c9e8d6c1129a6da6d88131efee
font_01_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 10392 bytes
SHA-256: 25c9d0bce041b4ef4d3c1b3bb2b1188f95cef1f8be4296a9921e6fef492c85f2

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