Malicious PDF — malware analysis report

Static analysis result for SHA-256 978d5d186f7149e6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 14:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5121e24f392091e0b0c5df09086d45d SHA-1: 34ba057dcabeadf3c605316e1e9ef64d345d2fd3 SHA-256: 978d5d186f7149e6cd4ba6dc0a6b51c74f3a987d835e4aeec5a960661077f237
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were found, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=redmi+6+pro+miui+12+update+download PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613968bb51634---12289151076.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/11773125803.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/43419283544.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300076d2288---jorub.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tozivetivubufe.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/82548636175.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/dumewolewuxexemosetalon.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/mujevowi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/46664570523.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zitefujete.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/38825925891.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e34ba7462---95527137715.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/9465604036.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/vefefijelirewuja.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/15395776877.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/11538095783.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/79500856968.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/godewavajuvumar.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/budupebotovadubex.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/61bccc3d91ad93deb8292981132c099d/wiwewazipev.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/85852239253.pdfIn PDF document text
    • http://drironcat.com/images/file/sufuvafaninexeli.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/76902320591.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/28112707954.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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 17392 bytes
SHA-256: 5aa040052c76fce3042d5dd71e5ece0bb65b70872baff64bb1919bb0022f225b
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10956 bytes
SHA-256: f03b59e16d29cfc31652d155de066cc2a9fca54ff52ce12318f7dcc7fb31110f

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