Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b3ce857f7d2733…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 09:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70e50ade331cba0fd82df23c96553747 SHA-1: 546121b3186e02a31cdf6ec5e630cf48c9acf3e5 SHA-256: 61b3ce857f7d27333eb3f5cbf9305a4e44a1ef5a6ee75c6d3e2cc1c77c95c9cc
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The presence of compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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=dictionary+of+globalization+pdf PDF link annotation
    • https://beliangka.com/contents//files/fakexanejexuwazojadelujep.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/dafodunesekelubovotex.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/92903580855.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac34e5d04c---81453027519.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608768106d432---sidipidufurozakoludesib.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/k76n065u8fi2t0ouia49lljrh9/pesuxovuz.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/jiwurazuxorapeju.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fe2c5b383---sixodinababizelumolaludev.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf75hasbfbrv0nospge2ftfs6g/58710478205.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e3b21199---kukaximufibixizirukuxe.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/49147248132.pdfIn PDF document text
    • http://kleiberit.ru/files/file/32058750568.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/jesobepekubatipavorawubu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c065e8955---75708438313.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/budamebunexebe.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/52856026304.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/19498423261.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/73384445959.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mraojpo07pbottmke76etv9tlt/36302904106.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160805f6af23ff---22071502277.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835e4bb6630---badejoxulexoxuguselabifo.pdfIn PDF document text
    • http://guchenes.com/d/files/xavokafof.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_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 16720 bytes
SHA-256: 634aad887cd024f9fe9ebefebc32365c57c1f89ddc1a8030a1cdfcca02387ac2
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10812 bytes
SHA-256: c16dafc6efe330efd2ea883843f159942cc5b616e695fa29897f61fb35b89dad

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