Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d564cca266d9cd0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 18:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73a784718f785d0d62c23b879af77af1 SHA-1: de5b3c068ddd18f89662d2083f9139dd9fba0213 SHA-256: 8d564cca266d9cd072981b25b2a9a6f36ac7ab1ee7d97e1f8bdf302a11320555
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. The numerous external URLs, many hosted on compromised WordPress sites, suggest a phishing or malware distribution campaign. ClamAV detection and ML classification further support the malicious nature of this file.

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 https://synerhu.ru/uplcv?utm_term=concordato+con+la+santa+sede+pdf PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c8d78412b---dokufosiwonarafilemosil.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/wuruduberofosapuvefuradom.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a9uqee8rfnvn8900ml9psmooag/mawekisesidekozevuv.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/lizugowojarivew.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zofabozaxobamuxizesig.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/873100dbb5ea638693dd040de193c315/77160656832.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/jewogogunabonuvenaja.pdfIn PDF document text
    • http://djpress.pl/Image/files/kofifax.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/1189597065.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/dukejusojupenitenasemopo.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/zulose.pdfIn PDF document text
    • http://samtekelektrik.com/files/donagenovepisapovirodadad.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1f6df5b3---87052327994.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/pujimeviwuna.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1001c5a66c79d21c3abcb643e87dc8f6/bamafajobaduzajabivofi.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/sabamewizu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac441917503---lezusurekixibelad.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g32735u4ahd2ss2jm93hsnnd1u/46543890402.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/nabepuxivinibago.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/woferulakomapaseninujeke.pdfIn PDF document text
    • http://darstin.com/userfiles/files/kunixa.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8e03e564280894e625cd68bc799fdc9a/27224865787.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_off0000b4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B3 10552 bytes
SHA-256: ef176ee16e432de6873db8db07e0fa9a38792db31d9131a5ae9fae75b0793a49
font_01_sfnt_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 15940 bytes
SHA-256: 115fde061fa6849907e140521e66b7f6d514b9f8549dafae23845633f6192130

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