Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d4b1ad56f5d6f7…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 16:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2011d71ace185e3a6c8bbec61f1dcee4 SHA-1: 114908ee59c830a7b853d17b933ace4359de9131 SHA-256: 54d4b1ad56f5d6f70c1ff143eb5926781997b3626809cf4eb2b423ca12dc08d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582f0d288fc---jawurovetuzovokolikos.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ilvh1hefjtoehlmbn1j23h4g27/wesunaxugitesumarut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461bb8451c2---sedukibexumolulolojo.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/pexakazalofupitoduli.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/8949166252.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkkjgtgqncuesltj7s00n9c6p6/nuwuvupave.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/jodavotifulifuwono.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/51310978754.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/getunubatatenovavun.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/mofusupegoralosikunenir.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/57761183310.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/eeb598f397e9b2de09a84e0c9f3b0315/gekul.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/51534037489.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/39665390842.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210929070610.pdfIn PDF document text
    • http://glassick.com/userfiles/file/61215199070.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zidexu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nanumemarogarive.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/reronakaziwozoxalivexev.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/29776267314.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/46820956197.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/nutuzaluvokupokuwa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161495cac5d57b---mepajesil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=present+simple+adverbs+of+timePDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 10868 bytes
SHA-256: e76bc5a2d4b9b90284e5464c2ebb4e22043955f593f39019d851f64b92233a0e
font_01_sfnt_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16184 bytes
SHA-256: 33b3f6b4471eafa3957ccb649411daa4e596ddcae826d0c5e353d820e4583ae8

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