Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fc6ad9e29d0e34…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 18:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 56aa2390d110c7772d523685f0641d34 SHA-1: 879be7d4feeb0019d2b1b2ced2a6b4bf44964c48 SHA-256: 17fc6ad9e29d0e34c670b7f81bf6dfae040d5b2856a0acdbdbc3f45c87fbeb38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=manuale+d%27amore+streaming+gratis PDF link annotation
    • http://veraschwemmle.de/fckdata/file/76515964079.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55922469479.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b563aabe910---73155228957.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9grljcvj2vhtjb3j7b507f9ch8/gugewebanoxej.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160741e91edac9---fasagipuzuxififipod.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7548c5e690---35653316722.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/sawiduvukofefigutakowif.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/494b5c6d161ae59e249db9e963f38422/29477812849.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5ef75cec---35924505123.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5a1433ed---mugasekafajal.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1a191eb3---torofibukut.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a951ce7274---6708867647.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/67893909363.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/tutelax.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zirawebowejonala.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/xixavosixo.pdfIn PDF document text
    • https://invest.pl/userfiles/file/78237251702.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/19588385985.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/virenofexamipepoxusena.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fm4j1unngg2jb7f6ols3pl9b7b/gopivixumar.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210822_8F52F03CDC8D6345.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c5a69e2c6ce6e87d1d9ab62db0537f7f/49074845388.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/88670315974.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/grsj22m34r6brftnu73aqc0pg6/wifin.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/78608795715.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5674a9a0---85230050150.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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 17632 bytes
SHA-256: e1fb1644ea7996b5b3ba65e91e6ea22b8201403eb75eb0546ef08adec1f8e306
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 10716 bytes
SHA-256: 08258314919b383fb31832ba73af68b48599940f631ba485694adec6b3a9c92c

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