Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2ffd8c4d221c80…

MALICIOUS

PDF

108.1 KB Created: 2021-07-18 13:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 363df6e1b34ed412557ebab9d62f9168 SHA-1: 909576c46569d7462317e0f08a5e90bbaae5d5cc SHA-256: 1a2ffd8c4d221c80e53a63d8174071ba129e3c66cbc99f6518f0f1e22d4da659
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, many of which host PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/daxobomefuverolesu.pdf In PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/1882321038.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c1009c9---70983640799.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/091c2b6da3afe80a8f1778b10a37ca27/litakiwojotapaf.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7af734d2d---goveboponesosuviluvi.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210622_203844.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607847ed67d47---gemixexotez.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/inu8vlip2nl6l0o2jb4mt8ne0j/91053990091.pdfIn PDF document text
    • http://effektfilm.de/files/file/nopuposimidelosegowuj.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210520001207.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/kodikojazu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rulejide.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/87234681189.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/13753152027.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7e466b54---dilekowinore.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbcb89109b---vizimarigakagozezobiwo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e81051c9---3128730478.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444b973ad2---762319899.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jazawotipidupelawodoj.pdfIn PDF document text
    • https://autotrasportifenoggio.it/file/mugezajutufivogawobode.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/kuvupovasezon.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/kerosokawomo.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/35238119916.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/89932866094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=growing+foxtail+fern+from+seedPDF 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_off00014174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14174 10924 bytes
SHA-256: a9bbeba94c0f0c3f36c02b908290bc0d0708348ef9f0bf1ceb70dfe26f7e7d68
font_01_sfnt_off00015aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA3 18280 bytes
SHA-256: aac96ea66179a9770cb4a3673a9ea1fdb2e8c5381416bc054bd36a43ab9d5945
font_02_sfnt_off00018adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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