Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc7f2a18a0112d6…

MALICIOUS

PDF

79.0 KB Created: 2021-10-23 00:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 116be62a634b4fda75e3041fdcc0e204 SHA-1: c48ee7c69f318c0415b82220391f809b5e3b7725 SHA-256: ffc7f2a18a0112d6958ca1855b25deea56d7d7398c8f71c90c7daa912422d67c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=management+research+paper PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c0fe05668---sinibanake.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/88326443711.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/53240941731.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20211005044831.pdfIn PDF document text
    • http://fkhd.cz/data/img/dojinufijul.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/raparos.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/mizizexexaniz.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/wosonekazowazuwivowimovi.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/duvuwegosunofudufari.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/beselajesojajebubapopolur.pdfIn PDF document text
    • http://tdbm.vn/upload/files/bodobukurilenete.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/41767825174.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614390fdc8810---30058048750.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20211023052641571478.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/aba1a3c8d1ddf6a003b2b322a29a73c0/14735312219.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16167dc433d7a5---14770290927.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/pobupuboxavamiwazejolak.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba8641ea5---45745331106.pdfIn PDF document text
    • http://guchen.ru/d/files/45063982831.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/rimopifisuwirila.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/16440470528.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/53791509974.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16288 bytes
SHA-256: 4481e2d515047096e7a934155f499a34e3c95ab74b1aa073f353235328afd1a8
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10556 bytes
SHA-256: e7d63ea5c1d9d89d219d78d1eea97546c62cda55995ea5c36ccc71e32e16a395
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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