Malicious PDF — malware analysis report

Static analysis result for SHA-256 163878988c9faec7…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 00:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be4f9c71b22e76a0cdcdbb18f787dbbc SHA-1: fe4c05c444f7732756133e26fa77d09ac2af050c SHA-256: 163878988c9faec7a33f52c002796cf26af9d04562a6bd725fc4725669878e16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDF documents. It also features a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=another+word+for+crown PDF link annotation
    • http://eshop-kocicinadeje.cz/files/file/60934049350.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/40902846813.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16078044de444e---8542011705.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24921beba---84830862295.pdfIn PDF document text
    • https://dhesient.com/media/20628444460.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474d941937---sotiluporamirugovuvoli.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/57601756774.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/akhg2kihq3dilmsvlcpp6vnpk5/saxijeguzamapopilu.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/biwavoba.pdfIn PDF document text
    • http://jar-ted.pl/file/porebasaxamuzokaponepawa.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/72645163665.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ab59c05f4904a6bdc927c24bf29f3a91/86260284081.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/gikojufim.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca94d7b016---24447921645.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc0ca2a180---xixitelofixamarazarabati.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/lebalejemugulunitom.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/niwagitusobupowesibu.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/34286169781.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/timamivuzilikinoxolujivu.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/11356668174.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/82348537208.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b003c23a4---38393196835.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/loxaputokutuseredotu.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/ruderuxunulu.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_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 10172 bytes
SHA-256: 216c27a6f9e4df625f3b376c649b24c4714e144e0d41c8ef90a88ac12eb90261
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 17900 bytes
SHA-256: d50ca1646d6a3bca964fa93633be6314ec945c91c7e0b4362d6bf35d50127cf5
font_02_sfnt_off000137b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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