Malicious PDF — malware analysis report

Static analysis result for SHA-256 574d4671a8264f5d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 07:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18e037bb31115a0b64ff0a04d37da748 SHA-1: c423257bf986ccc11730805f5793f3646998c79e SHA-256: 574d4671a8264f5d6bb554e8736de95bd34f16f382d7d7011a237ff47cd6bfc4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious payloads. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133db96daeac---ledajejitenakek.pdf In PDF document text
    • http://simonide.org/userfiles/file/72231782397.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/morurog.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/7765025123.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/15473514631.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/sinepe.pdfIn PDF document text
    • https://equinox-e.com/upload/files/76367795277.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gevodoromumibob.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332e7a3a7b---zojafa.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/baluzobefapibedizemikipen.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/86825795571.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a9a3ac2c83b9af95d7696bf5ca1fad2/89939084362.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/37435081668.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/38569040571.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/36049638424.pdfIn PDF document text
    • http://juncheng.tw/upload/files/81972975488.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/debovosun.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/39201146785.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a007509f938f36a0b59caae905272e4a/7775256279.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/331162689.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142e9c975b---vusatosodovewitera.pdfIn PDF document text
    • http://superazs.ru/images/news/file/bosijadipologilezusujapag.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/5666781590.pdfIn PDF document text
    • http://bmw-zona.ru/uploads/file/71342293055.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149e8ce21eea---jikaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=collage+app+download+apkPDF 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_off0000b4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B6 14816 bytes
SHA-256: 345d6e5d612322f13244e0a45754df281353731b84dd47e8b053010a24394525
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 10316 bytes
SHA-256: cae4dfa5953c8b99cb08f1231e42e251573414694cdb363f72badc59fd4235ea
font_02_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1