Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42907389bc5ead…

MALICIOUS

PDF

68.3 KB Created: 2021-09-22 12:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b95810e2cbf8d6daa2bc9a84302339e5 SHA-1: 3806efbfe72b5a6e1e46837b747a965fc6707f91 SHA-256: cd42907389bc5ead8ba18b0364f725c07aefef563dc2431d9ced2b7fecfab2fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as malicious and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links on disposable or potentially compromised hosting suggests an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6857ad90d39b8dd48878311b98d94809/30406615099.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec68395d04---39713848738.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/83464969038.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/nogatuwubuwuzinenutix.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/gebovira.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/rotedipavepogido.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/3112379003.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16148c06068ada---83507858492.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/lululonawaxidabera.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/99822608069.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_023638.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/6514426482.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/67067888929.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/25497106266.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/beboxesuriga.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/23696046745.pdfIn PDF document text
    • http://kelsenator.com/userimages/gagudawomi.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/fagizilazuzusiranepexa.pdfIn PDF document text
    • http://888chji.com/userfiles/files/mutejutobajobus.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090900354073499.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/77539662665.pdfIn PDF document text
    • http://renknh.com/ckupload/files/87041944433.pdfIn PDF document text
    • http://bdnchem.com/upload/files/47759809451.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/20647071603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mod+family+farm+adventurePDF link annotation
    • 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_off0000af74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 14408 bytes
SHA-256: fd47a2a2ced2b45af78cc130e3f84190a28812ddf1b21f158e0d6eb4c8387c01
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 10620 bytes
SHA-256: 11fea43959544d9a23818ea362914add9ba31e3331f25cb2a43acd3df6d59596