Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66a943aa238e1ff…

MALICIOUS

PDF

85.2 KB Created: 2021-07-31 12:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dd9df969752d6e94bc7cdc3cf4cf248 SHA-1: 9563c63a49265d6f32f4aae7546aa94a7006815e SHA-256: f66a943aa238e1ff8b4cf966b9076b6bdc8ec966df42693ddf6e22bb3f53adc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, serving as a lure for phishing or malware delivery. The numerous URLs extracted, many hosted on potentially compromised or disposable domains, further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ingmontagna.com/userfiles/files/11641042471.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/43558538876.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/48507706883.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f00c7c34b---44185343854.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/99693629168.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/pumitononanubabizolekopuk.pdfIn PDF document text
    • http://imbirimbir.ru/files/runibuxemawopenadinesi.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/65472081265.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/faf68d66e3aaacb2852abcbf8bf4849e/dukom.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dfbc2d68---96882185336.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/35312652985.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/sevibiximulinabiripewilo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1a4fb42ba0b64d4af0829eca2d676eba/mulizijenulawoguliz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752cf043f1b---85304528003.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/13363979252.pdfIn PDF document text
    • http://parfumkin.ru/files/files/jisulipojerebujakejigad.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608985d2d6a30---87115863142.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bccec7b7612---sibibupenoxot.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/30157878620.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b350089b5f---66838243634.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c1e2664e8245e50b7d9622c395cc3e83/vadazubosalapemo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/46138352990.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c62c75d40---sovule.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/051a91c3423d32730feb37ac1882b11b/ruluragonebavunidofu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/53674105926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=helmet+visor+strip+templatePDF 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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 10368 bytes
SHA-256: 990429514069d5779ea6c04ede141edfc22a47c6f3a790264128e28de703fc27
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 17116 bytes
SHA-256: 4d75d3315905ad987f5cd031672b3a9ded919de07c8d8651f80ec4885d71d8b9

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