Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb4e9046d53dc6f…

MALICIOUS

PDF

72.1 KB Created: 2021-07-02 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9efd609baef7d10c3e1bea2c9c77d140 SHA-1: 64b1bfb0e5af2e78c73229dc8867597d7c38eccc SHA-256: 0cb4e9046d53dc6f024331c608ab6519ad899d1b1160a30154d39f9bfaf63c5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crewmak.ru/uplcv?utm_term=tell+me+why+you+are+a+good+fit+for+this+position PDF link annotation
    • https://handinhand-daycare.com/ckfinder/userfiles/files/vokobukufidoxesefivun.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fumerorokokej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e8525f25---punetotajozifulegebi.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/muwofumubolewikokufemasu.pdfIn PDF document text
    • http://envigest.cz/upload/file/42975242981.pdfIn PDF document text
    • http://accronline.com/userfiles/file/42273905540.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bd2tg2qft9o1gbj3tfs6r2quk1/tadebusejabevudebajusezam.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090eec41853c---kafofilijorilobuzapad.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d666a6b234---14711498064.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lmqits625h7iv6a9pbt6rsvj68/jaboboputopolalo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/s77ol5cl7prjhh9rqd6cn4i19l/84129590285.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101d2ef87f---75133884410.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/42675342418.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/tawavapakedeteguro.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mizowobonasozibagu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/987a38181ca0af4284d36729465549df/23168378090.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607591f9efaf3---zoworefa.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608805d2e9a2c---radiwupolibup.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fcb04e31f952fb71f317905b59f097b2/83332678544.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/40415986922.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/vedanexowizalabeneran.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///96637598586.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae8835e110ed79bf911a161dccce897/bokonu.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/lunaxuguwetami.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed19c12b2---27463269346.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69658ebb67---xidawimifojikix.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_off0000ba24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA24 15068 bytes
SHA-256: 736f70f944272c38110eeadd92a8e0b6b36e4221a69d902741646b76fc4413ea
font_01_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 11208 bytes
SHA-256: 1166cc4676cbb517c4e75847822ce791c1e4b46eedd0c949f571c512a7f0a331
font_02_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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